Was self employed claiming benefits?
they think that people who were self employed made themselves unemployed to claim benefit, you dad should fight for all his right as he paid tax and has the right now to claim his rights. Ask him to check with the social security all his rights and make an appointment with them to explain his situation.
Dont tell him about the benefits otherwise he will spend all his time at home and keep walking about the house and getting under your mums feet like mine does lol seriously- mine is the same age and has been on pension credit for over a year now and gets everything paid including, mortgage, council tax etc and also gets £70 odd a week but he has never been self employed. I think it largely depends on your savings. I doubt anyone will come to your house though. Your best bet is to contact the jobcentre/dwp directly.