Sorry to post here but wanting to help my sister who is struggling. She has 2 children aged 3 and 15 months. The 3 year old is currently undergoing testing for his behaviour - I suspect he has high functioning autism. He stated to become very aggressive with his baby brother so my sister is very careful to never leave them alone. She is a single parent so it’s very difficult. Car journeys are becoming a nightmare as the 3 year old keeps leaning over and squeezing and pinching baby very hard. She can’t use front seat as there is an air bag that can’t be turned off. He has also stated taking belt off. I thought I would check if anyone has any suggestions. He just grins if told off and shows no remorse. Bribes are not working either. Any different seatbelts available?