My friend rents a 2 bed house from a housing association for herself and her DD. She moved from a 3 bed to a 2 bed when her son moved in with his gf 18 months ago. After she'd moved, her son split with his gf and moved back in with her. He's been sleeping on the sofa for the past year. He refuses to go and takes money from her purse and bank account. She's asked him to go on numerous occasions and hates being in her own home, as does her DD, because of the mess, tension etc.
How does she get him out?