diff --git a/apps/api/src/routes/appointmentGroups.ts b/apps/api/src/routes/appointmentGroups.ts
index 8ecbb45..859f64e 100644
--- a/apps/api/src/routes/appointmentGroups.ts
+++ b/apps/api/src/routes/appointmentGroups.ts
@@ -16,8 +16,9 @@ import {
   services,
   staff,
 } from "@groombook/db";
+import type { AppEnv } from "../middleware/rbac.js";
 
-export const appointmentGroupsRouter = new Hono();
+export const appointmentGroupsRouter = new Hono<AppEnv>();
 
 // ─── Schemas ──────────────────────────────────────────────────────────────────
 
@@ -49,6 +50,8 @@ appointmentGroupsRouter.get("/", async (c) => {
   const clientId = c.req.query("clientId");
   const from = c.req.query("from");
   const to = c.req.query("to");
+  const staffRow = c.get("staff");
+  const isGroomer = staffRow?.role === "groomer";
 
   const groupConditions = clientId
     ? [eq(appointmentGroups.clientId, clientId)]
@@ -79,7 +82,7 @@ appointmentGroupsRouter.get("/", async (c) => {
     groupApptMap.get(appt.groupId)!.push(appt);
   }
 
-  const result = groups
+  let result = groups
     .map((g) => ({
       ...g,
       appointments: (groupApptMap.get(g.id) ?? []).sort(
@@ -88,6 +91,15 @@ appointmentGroupsRouter.get("/", async (c) => {
     }))
     .filter((g) => !from || g.appointments.length > 0);
 
+  // Groomer: filter to groups where at least one appointment is assigned to them
+  if (isGroomer) {
+    result = result.filter((g) =>
+      g.appointments.some(
+        (a) => a.staffId === staffRow.id || a.batherStaffId === staffRow.id
+      )
+    );
+  }
+
   return c.json(result);
 });
 
@@ -96,6 +108,8 @@ appointmentGroupsRouter.get("/", async (c) => {
 appointmentGroupsRouter.get("/:id", async (c) => {
   const db = getDb();
   const id = c.req.param("id");
+  const staffRow = c.get("staff");
+  const isGroomer = staffRow?.role === "groomer";
 
   const [group] = await db
     .select()
@@ -112,6 +126,7 @@ appointmentGroupsRouter.get("/:id", async (c) => {
       serviceName: services.name,
       staffId: appointments.staffId,
       staffName: staff.name,
+      batherStaffId: appointments.batherStaffId,
       status: appointments.status,
       startTime: appointments.startTime,
       endTime: appointments.endTime,
@@ -125,6 +140,14 @@ appointmentGroupsRouter.get("/:id", async (c) => {
     .where(eq(appointments.groupId, id))
     .orderBy(appointments.startTime);
 
+  // Groomer: verify at least one appointment in the group is assigned to them
+  if (isGroomer) {
+    const hasAccess = groupAppts.some(
+      (a) => a.staffId === staffRow.id || a.batherStaffId === staffRow.id
+    );
+    if (!hasAccess) return c.json({ error: "Forbidden" }, 403);
+  }
+
   const [client] = await db
     .select({ name: clients.name, email: clients.email })
     .from(clients)
@@ -140,6 +163,14 @@ appointmentGroupsRouter.post(
   zValidator("json", createGroupSchema),
   async (c) => {
     const db = getDb();
+    const staffRow = c.get("staff");
+    const isGroomer = staffRow?.role === "groomer";
+
+    // Only managers and receptionists can create group bookings
+    if (isGroomer) {
+      return c.json({ error: "Forbidden: groomers cannot create group bookings" }, 403);
+    }
+
     const body = c.req.valid("json");
     const startTime = new Date(body.startTime);
 
@@ -244,6 +275,27 @@ appointmentGroupsRouter.patch(
     const db = getDb();
     const id = c.req.param("id");
     const body = c.req.valid("json");
+    const staffRow = c.get("staff");
+    const isGroomer = staffRow?.role === "groomer";
+
+    // Verify group exists
+    const [group] = await db
+      .select()
+      .from(appointmentGroups)
+      .where(eq(appointmentGroups.id, id));
+    if (!group) return c.json({ error: "Not found" }, 404);
+
+    // Groomer: verify at least one appointment in the group is assigned to them
+    if (isGroomer) {
+      const groupAppts = await db
+        .select({ staffId: appointments.staffId, batherStaffId: appointments.batherStaffId })
+        .from(appointments)
+        .where(eq(appointments.groupId, id));
+      const hasAccess = groupAppts.some(
+        (a) => a.staffId === staffRow.id || a.batherStaffId === staffRow.id
+      );
+      if (!hasAccess) return c.json({ error: "Forbidden" }, 403);
+    }
 
     const [updated] = await db
       .update(appointmentGroups)
@@ -251,7 +303,6 @@ appointmentGroupsRouter.patch(
       .where(eq(appointmentGroups.id, id))
       .returning();
 
-    if (!updated) return c.json({ error: "Not found" }, 404);
     return c.json(updated);
   }
 );
@@ -261,13 +312,27 @@ appointmentGroupsRouter.patch(
 appointmentGroupsRouter.delete("/:id", async (c) => {
   const db = getDb();
   const id = c.req.param("id");
+  const staffRow = c.get("staff");
+  const isGroomer = staffRow?.role === "groomer";
 
   const [group] = await db
-    .select({ id: appointmentGroups.id })
+    .select()
     .from(appointmentGroups)
     .where(eq(appointmentGroups.id, id));
   if (!group) return c.json({ error: "Not found" }, 404);
 
+  // Groomer: verify at least one appointment in the group is assigned to them
+  if (isGroomer) {
+    const groupAppts = await db
+      .select({ staffId: appointments.staffId, batherStaffId: appointments.batherStaffId })
+      .from(appointments)
+      .where(eq(appointments.groupId, id));
+    const hasAccess = groupAppts.some(
+      (a) => a.staffId === staffRow.id || a.batherStaffId === staffRow.id
+    );
+    if (!hasAccess) return c.json({ error: "Forbidden" }, 403);
+  }
+
   await db
     .update(appointments)
     .set({ status: "cancelled", updatedAt: new Date() })
diff --git a/apps/api/src/routes/appointments.ts b/apps/api/src/routes/appointments.ts
index 6ed72e2..546c6b0 100644
--- a/apps/api/src/routes/appointments.ts
+++ b/apps/api/src/routes/appointments.ts
@@ -163,6 +163,29 @@ appointmentsRouter.post(
           }
         }
 
+        // Check batherStaffId conflicts if set
+        if (apptFields.batherStaffId) {
+          const conflicts = await tx
+            .select({ id: appointments.id })
+            .from(appointments)
+            .where(
+              and(
+                or(
+                  eq(appointments.staffId, apptFields.batherStaffId),
+                  eq(appointments.batherStaffId, apptFields.batherStaffId)
+                ),
+                lt(appointments.startTime, end),
+                gte(appointments.endTime, start),
+                ne(appointments.status, "cancelled"),
+                ne(appointments.status, "no_show"),
+              )
+            )
+            .limit(1);
+          if (conflicts.length > 0) {
+            throw Object.assign(new Error("conflict"), { statusCode: 409 });
+          }
+        }
+
         if (!recurrence) {
           // Single appointment
           const [inserted] = await tx
@@ -461,6 +484,34 @@ appointmentsRouter.patch(
             }
           }
 
+          // Check batherStaffId conflicts if being updated or already set
+          const batherStaffId =
+            updateFields.batherStaffId !== undefined
+              ? updateFields.batherStaffId
+              : current.batherStaffId;
+          if (batherStaffId) {
+            const conflicts = await tx
+              .select({ id: appointments.id })
+              .from(appointments)
+              .where(
+                and(
+                  or(
+                    eq(appointments.staffId, batherStaffId),
+                    eq(appointments.batherStaffId, batherStaffId)
+                  ),
+                  lt(appointments.startTime, end),
+                  gte(appointments.endTime, start),
+                  ne(appointments.status, "cancelled"),
+                  ne(appointments.status, "no_show"),
+                  ne(appointments.id, id),
+                )
+              )
+              .limit(1);
+            if (conflicts.length > 0) {
+              throw Object.assign(new Error("conflict"), { statusCode: 409 });
+            }
+          }
+
           const [updated] = await tx
             .update(appointments)
             .set(update)
diff --git a/apps/api/src/routes/groomingLogs.ts b/apps/api/src/routes/groomingLogs.ts
index 81eeaf4..6e0aadb 100644
--- a/apps/api/src/routes/groomingLogs.ts
+++ b/apps/api/src/routes/groomingLogs.ts
@@ -1,9 +1,10 @@
 import { Hono } from "hono";
 import { zValidator } from "@hono/zod-validator";
 import { z } from "zod/v3";
-import { desc, eq, getDb, groomingVisitLogs } from "@groombook/db";
+import { and, appointments, desc, eq, getDb, groomingVisitLogs, or } from "@groombook/db";
+import type { AppEnv } from "../middleware/rbac.js";
 
-export const groomingLogsRouter = new Hono();
+export const groomingLogsRouter = new Hono<AppEnv>();
 
 const createLogSchema = z.object({
   petId: z.string().uuid(),
@@ -19,7 +20,29 @@ const createLogSchema = z.object({
 groomingLogsRouter.get("/", async (c) => {
   const db = getDb();
   const petId = c.req.query("petId");
+  const staffRow = c.get("staff");
+  const isGroomer = staffRow?.role === "groomer";
+
   if (!petId) return c.json({ error: "petId is required" }, 400);
+
+  // Groomer: verify they have at least one appointment for this pet
+  if (isGroomer) {
+    const [hasAppt] = await db
+      .select({ id: appointments.id })
+      .from(appointments)
+      .where(
+        and(
+          eq(appointments.petId, petId),
+          or(
+            eq(appointments.staffId, staffRow.id),
+            eq(appointments.batherStaffId, staffRow.id)
+          )
+        )
+      )
+      .limit(1);
+    if (!hasAppt) return c.json({ error: "Forbidden" }, 403);
+  }
+
   const rows = await db
     .select()
     .from(groomingVisitLogs)
@@ -33,7 +56,46 @@ groomingLogsRouter.post(
   zValidator("json", createLogSchema),
   async (c) => {
     const db = getDb();
-    const { groomedAt, ...rest } = c.req.valid("json");
+    const { groomedAt, appointmentId, ...rest } = c.req.valid("json");
+    const staffRow = c.get("staff");
+    const isGroomer = staffRow?.role === "groomer";
+
+    // Groomer: verify they have at least one appointment for this pet
+    if (isGroomer) {
+      const [hasAppt] = await db
+        .select({ id: appointments.id })
+        .from(appointments)
+        .where(
+          and(
+            eq(appointments.petId, rest.petId),
+            or(
+              eq(appointments.staffId, staffRow.id),
+              eq(appointments.batherStaffId, staffRow.id)
+            )
+          )
+        )
+        .limit(1);
+      if (!hasAppt) return c.json({ error: "Forbidden" }, 403);
+
+      // If appointmentId is provided, verify groomer is assigned to that specific appointment
+      if (appointmentId) {
+        const [appt] = await db
+          .select({ id: appointments.id })
+          .from(appointments)
+          .where(
+            and(
+              eq(appointments.id, appointmentId),
+              or(
+                eq(appointments.staffId, staffRow.id),
+                eq(appointments.batherStaffId, staffRow.id)
+              )
+            )
+          )
+          .limit(1);
+        if (!appt) return c.json({ error: "Forbidden" }, 403);
+      }
+    }
+
     const [row] = await db
       .insert(groomingVisitLogs)
       .values({
@@ -47,10 +109,38 @@ groomingLogsRouter.post(
 
 groomingLogsRouter.delete("/:id", async (c) => {
   const db = getDb();
-  const [row] = await db
+  const id = c.req.param("id");
+  const staffRow = c.get("staff");
+  const isGroomer = staffRow?.role === "groomer";
+
+  // Fetch the log to get the petId
+  const [log] = await db
+    .select()
+    .from(groomingVisitLogs)
+    .where(eq(groomingVisitLogs.id, id));
+  if (!log) return c.json({ error: "Not found" }, 404);
+
+  // Groomer: verify the log's petId links to an appointment where groomer is assigned
+  if (isGroomer) {
+    const [hasAppt] = await db
+      .select({ id: appointments.id })
+      .from(appointments)
+      .where(
+        and(
+          eq(appointments.petId, log.petId),
+          or(
+            eq(appointments.staffId, staffRow.id),
+            eq(appointments.batherStaffId, staffRow.id)
+          )
+        )
+      )
+      .limit(1);
+    if (!hasAppt) return c.json({ error: "Forbidden" }, 403);
+  }
+
+  await db
     .delete(groomingVisitLogs)
-    .where(eq(groomingVisitLogs.id, c.req.param("id")))
-    .returning();
-  if (!row) return c.json({ error: "Not found" }, 404);
+    .where(eq(groomingVisitLogs.id, id));
+
   return c.json({ ok: true });
 });