i just found out my autistic uncle is homeless and i'm so worried

i (17) haven't spoken to my mums side of the family in nearly 10 years. my mum's mum has some sort of undiagnosed personality disorder and refused to ever see me or my sister again because she found a garden ornament broken (not even relevant but we didn't even break it, she just decided that we did). i wasn't too upset at the time because i didn't like her very much anyway, but because of how she is, it meant none of us could speak to my mum's siblings either. so, we just don't talk to that side of the family.

i was in work tonight and a man walked in. despite it being nearly 10 years and him having a full beard (he's now nearly 30), he had the exact same eyes and i knew it was my uncle. he's got autism, not super super severe, but the kind where he'd either need to live at home or a social worker to visit him daily or something.

on his way back out, he came over. we haven't talked since i was 8 and we were talking about how long it had been. he said 'yeah, because all that shit happened with my mum.' and rolled his eyes and i knew he mustn't be on good terms with her either. he then told me he was living alone, which i was happy to hear because the last time id seen him, that wasnt something that would've been on the cards for him. we talked for a little longer and he said he was really happy to see me and left.

i called my mum to tell her i'd seen him and she asked how she was doing and i told her he was living alone and she asked where and i said 'he said it's just across the road from here' (my work). she went really quiet for a few seconds and said 'that's for homeless people.'

i'm so worried. it's tiny. they're literally shipping containers. they're barely big enough to fit a bed. a lot of the people that live there are drug addicts (not shaming addicts - i'm just worried he might get involved in things he shouldn't). if he had a social worker, they wouldn't let him live there. if he's living there, he's not speaking to my granny, which means he's not speaking to any of the family. he's an autistic man, alone, homeless, with no support or family and the only network around him are homeless too and can't help him.

my mum's going there tomorrow to ask if the homeless centre will let her speak to him, and if not she's gonna try and leave her number so he can get in touch. he's such a lovely man and i'm so worried that he has absolutely none of the support that he desperately needs.