My BIL has lived in a housing association house for all his life. The house belonged to his parents and it was transferred over to him when they died 10+ years ago.
He has had the idea from a friend that he could let out this house as a private rental when he goes travelling later this year so that he has the house to move back into when he returns.
This would also provide him with an income while he is away.
I have told him this is madness as if the housing association find out he will surely lose the house but he is adament that 'everyone does it' 
Anyone in the know who can help me make him see sense?
Tia