My boyfriend of 6 years moved in with me and my son this year. I lost my home leaving an abusive husband in austria 9 years ago and wasn't able to buy until 2013, when I got a tiny 2 bedroom house with a mortgage of 650 per month. Boyfriend owns a house in Scotland which he lets out for 500 to a friend. He now pays 250 per month towards bills. As he's moved in I've lost my working and child tax credits. I have 2 part time jobs to pay the bills and support my daughter through uni. Their father doesn't pay any maintenance or child support despite a court order. I struggle to pay for everything and it would really help if boyfriend would pay more, but it is very hard to work out what is reasonable. We are both earning roughly the same, neither of us very much. Would a legal agreement between us be a good idea?