diff --git a/.ameba.yml b/.ameba.yml
index a661a83d..e336f5c0 100644
--- a/.ameba.yml
+++ b/.ameba.yml
@@ -54,8 +54,7 @@ Documentation/DocumentationAdmonition:
   Enabled: false
 
 Style/MultilineStringLiteral:
-  Excluded:
-    - spec/**/*
+  Enabled: false
 
 Lint/BeTruthy:
   Enabled: false
@@ -68,3 +67,15 @@ Lint/SpecFilename:
 Lint/UselessAssign:
   Excluded:
     - spec/**/*
+
+Lint/WhitespaceAroundMacroExpression:
+  Enabled: false
+
+Style/PercentLiteralDelimiters:
+  Enabled: false
+
+Style/RedundantSelf:
+  Enabled: false
+
+Lint/SpecEqWithBoolOrNilLiteral:
+  Enabled: false
diff --git a/OPENAPI_DOC.yml b/OPENAPI_DOC.yml
index 189deb6d..a2db8cf4 100644
--- a/OPENAPI_DOC.yml
+++ b/OPENAPI_DOC.yml
@@ -3253,6 +3253,12 @@ paths:
         schema:
           type: integer
           format: Int64
+      - name: include_linked
+        in: query
+        description: include guests from linked (child) bookings
+        example: "true"
+        schema:
+          type: boolean
       - name: instance
         in: query
         description: a recurring instance id
diff --git a/spec/controllers/bookings_spec.cr b/spec/controllers/bookings_spec.cr
index 31d5e9b5..079fda4f 100644
--- a/spec/controllers/bookings_spec.cr
+++ b/spec/controllers/bookings_spec.cr
@@ -1432,6 +1432,67 @@ describe Bookings do
     body.map(&.["name"]).should eq([guest.name])
   end
 
+  it "#guest_list with include_linked should include guests from child bookings" do
+    tenant = get_tenant
+    user_email = Faker::Internet.email
+
+    parent = BookingsHelper.create_booking(
+      tenant_id: tenant.id.not_nil!,
+      user_email: user_email,
+      booking_type: "group",
+    )
+
+    parent_guest = GuestsHelper.create_guest(tenant.id, "parent-guest@example.com")
+    Attendee.create!(booking_id: parent.id.not_nil!,
+      guest_id: parent_guest.id,
+      tenant_id: parent_guest.tenant_id,
+      checked_in: false,
+      visit_expected: true,
+    )
+
+    child = BookingsHelper.create_booking(
+      tenant_id: tenant.id.not_nil!,
+      user_email: user_email,
+      booking_type: "visitor",
+      parent_id: parent.id,
+    )
+
+    child_guest = GuestsHelper.create_guest(tenant.id, "child-guest@example.com")
+    Attendee.create!(booking_id: child.id.not_nil!,
+      guest_id: child_guest.id,
+      tenant_id: child_guest.tenant_id,
+      checked_in: false,
+      visit_expected: true,
+    )
+
+    # Without include_linked: only the parent's own guest is returned
+    body = JSON.parse(client.get("#{BOOKINGS_BASE}/#{parent.id}/guests", headers: headers).body).as_a
+    body.map(&.["email"]).should eq([parent_guest.email])
+
+    # With include_linked: guests from both parent and child are returned
+    body = JSON.parse(client.get("#{BOOKINGS_BASE}/#{parent.id}/guests?include_linked=true", headers: headers).body).as_a
+    emails = body.map(&.["email"].as_s).sort!
+    emails.should eq(["child-guest@example.com", "parent-guest@example.com"])
+
+    # include_linked on a child booking should be silently ignored —
+    # only the child's own guests are returned
+    body = JSON.parse(client.get("#{BOOKINGS_BASE}/#{child.id}/guests?include_linked=true", headers: headers).body).as_a
+    body.map(&.["email"].as_s).should eq([child_guest.email])
+
+    # Deduplication: add the same guest (parent_guest) to the child booking.
+    # The API should return only one entry per email address.
+    Attendee.create!(booking_id: child.id.not_nil!,
+      guest_id: parent_guest.id,
+      tenant_id: parent_guest.tenant_id,
+      checked_in: false,
+      visit_expected: true,
+    )
+
+    body = JSON.parse(client.get("#{BOOKINGS_BASE}/#{parent.id}/guests?include_linked=true", headers: headers).body).as_a
+    emails = body.map(&.["email"].as_s).sort!
+    emails.should eq(["child-guest@example.com", "parent-guest@example.com"])
+  end
+
   describe "permission", tags: ["auth", "group-event"] do
     it "#add_attendee should NOT allow adding public or same tenant users to PRIVATE bookings" do
       WebMock.stub(:post, "#{ENV["PLACE_URI"]}/auth/oauth/token")
diff --git a/src/controllers/bookings.cr b/src/controllers/bookings.cr
index c6b72088..ad206c90 100644
--- a/src/controllers/bookings.cr
+++ b/src/controllers/bookings.cr
@@ -963,10 +963,30 @@ class Bookings < Application
 
   # returns a list of guests associated with a booking
   @[AC::Route::GET("/:id/guests")]
-  def guest_list : Array(Guest)
-    booking.attendees.to_a.map do |visitor|
+  def guest_list(
+    @[AC::Param::Info(description: "include guests from linked (child) bookings", example: "true")]
+    include_linked : Bool = false,
+  ) : Array(Guest)
+    guests = booking.attendees.to_a.map do |visitor|
       visitor.guest.not_nil!.for_booking_to_h(visitor, booking)
     end
+
+    if include_linked && booking.parent?
+      Booking.where(parent_id: booking.id)
+        .join(:left, Attendee, :booking_id)
+        .join(:left, Guest, "guests.id = attendees.guest_id")
+        .to_a.each do |child|
+        child.attendees.to_a.each do |visitor|
+          guests << visitor.guest.not_nil!.for_booking_to_h(visitor, child)
+        end
+      end
+
+      # Deduplicate by email in case a guest appears on both the parent
+      # and a child booking
+      guests.uniq! { |guest| guest.email.downcase }
+    end
+
+    guests
   end
 
   # marks the standalone visitor as checked-in or checked-out based on the state param