diff --git a/backend/app/models/child.py b/backend/app/models/child.py
index c78c875..7883287 100644
--- a/backend/app/models/child.py
+++ b/backend/app/models/child.py
@@ -16,8 +16,8 @@ class Child(TimestampMixin, Base):
 
     user: Mapped["User"] = relationship("User", back_populates="children")  # noqa: F821
     daily_sessions: Mapped[list["DailySession"]] = relationship(  # noqa: F821
-        "DailySession", back_populates="child"
+        "DailySession", back_populates="child", passive_deletes=True
     )
     activity_logs: Mapped[list["ActivityLog"]] = relationship(  # noqa: F821
-        "ActivityLog", back_populates="child"
+        "ActivityLog", back_populates="child", passive_deletes=True
     )