Thank you very much Kml. I'm the biggest earner and he has no pension, so by having him signing that he gets 50 % of sale of the house but leaves the rest alone, I'm protecting myself. He has more to gain from me, than me from him!

I don't want to fight. I know that financially I'll be fine. Having the new house is a good start for me as I'll have a low mortgage and I even calculated that without child maintenance from him I still be able to have a descent life. I don't want to be too generous, but I want to be fair to him as he sold his first house to allow us to buy the one we are selling now.