Homelessness & financial help advice UK

I wanted to come on here and ask for some advice on what I can do to help out someone I know.

i have a distant friend who’s mum is now homeless due to her husband losing their council house. The daughter is married and has 2 small children of her own and relies on her husband to provide financially, so she‘s in A tough spot herself in terms of helping her mum but does what she can. Her brother has started to follow in their dads footsteps, never at home, messing about with drugs & consistently comes back to the mum demanding money and resorting to abuse when he doesn’t get his way.

what advice or help is there in the UK that will help her regain financial security & stop her from being homeless