Is it illegal to double buckle your children in the back seat of a vehcile?

Yes, it is generally illegal to double buckle children in the back seat of a vehicle. Double buckling occurs when two children share a seat belt, which is unsafe and against safety regulations. Each child should be secured in their own appropriate car seat or seat belt to ensure their safety in the event of an accident. Laws may vary by jurisdiction, so it's important to check local regulations regarding child passenger safety.