Brothers who were misinformed they could exchange their rented properties fear they could be made homeless.
Trevor Walyers, who has cerebral palsy, struggled to look after the family home after his mother died last year.
The brothers decided to carry out a mutual exchange, which gives social housing tenants the option to move home by swapping properties.
After filling in the paperwork Mr Walters was informed by his housing officer it could go ahead.
He moved into the address in Cobham Close, Battersea, alongside his children and grandchildren, aged four and five.
Mr Norris moved into the flat in Fairchild Close, Battersea, with their other brother Trevor Waters, and spends some of the week in respite care.
But on January 13 they were told the mutual exchange could no longer go ahead, as Mr Norris was under occupying the two bed flat because he received care elsewhere during the week.
Mr Walters, an operating theatre technician, said: "I am now in a position they are going to evict us both from the flat we are in, and the children and my grandchildren.
"Nobody has told us what we are supposed to do next.
"This was my disabled brother's family home, he can't speak for himself, he can't write a letter of complaint saying you can't take this home from me."
A spokeswoman from Viridian Housing said: "We are currently in touch with Mr Walters regarding his complaint over our handling of his request for a mutual exchange.
"We are investigating the complaint and will respond directly to Mr Walters once this has been concluded."
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