Ex husband walked out 10 years ago leaving SIL to bring up 2DC, at the time through a solicitor it was agreed he would get 40% of house equity when house was sold when DC leave education. However he has since not paid any child maintenance or contributed to house in any way, SIL has struggled to keep house going paying mortgage, bills etc and GP's have helped out occasionally to keep roof over their heads. Ex is now pressing for sale of house, can anyone advise if it's worth pursuing to see if lack of child maintenance/household bills can be deducted from his 40%? My SIL never really got the CSA involved,(she did initaially and got a couple of £20 payment's) she suffered mental abuse from Ex over years, and she always wanted to keep the peace for the sake of her DC.