A close relative has a 9 year old boy who she says is now a girl. We are fine if the child is and would want to support him/her in social transitioning but the child has spent lots of time with us and lived with us for a year and has expressed that even though he likes long hair he is a boy and cant understand why some people call / mistake him for a girl as he doesn't like it. He has said numerous times that he's a boy.He is asd. He talked to his dad ( divorced)about it as he said his mum had told him he was trans and he weighed things up and said he still saw himself as a boy. His dad is pro trans rights but feels that his son isn't trans from what hesaid and what he's seen. He told his dad he had a crush on a girl and later said he had a girl friend. He is attracted to stereotypical boys interests weapons, war/ destruction type video games etc even though he's been given a variety of toys and encouraged to try all sorts of hobbies etc. He prefers to play with boys but if there are no boys about he'll mix and play with girls. His mum is lesbian and has lots of trans friends.We've all fully supported her. She has a number of MH issues and is hf asd herself, bipolar and has personality disorders. She has cut the child completely off from his dad and all family and friends and has told the school he now has a girls name and that they are to use it and female pronouns. If the child is trans why has the mother cut him off from all family as they would support him? We are worried that the mother is pushing the child to be trans as strange as it might seem.She told us when he was a few months old that she wanted him to be gay - we feel he should make the decision whether he is gay or straight. We, his dad and his grandparents have not been allowed to speak to him/ her and we would fully support their own decision. We have had a close relationship and can't understand why we can't see or talk to the child. If we felt that the child was trans and the mother was against it we be supporting him and we feel that all the signs are that he isn't . He's also young and there would be no harm in taking things slowly and perhaps being gender fluid for a while.The child's isolation is worrying in our opinion and unnecessary. School say nothing has changed but they have gone along with the new name and pronouns. We think the child has gone along with mum to please her.Opinions and advice please.Thank you.