Could do with a bit of advice on behalf of my sister if anyone has any ideas ? She owns a house with her ex husband , well they aren't actually divorced but split approximately 6 years ago. She owns 60% him the other 40%, - joint mortgage. She pays nothing towards it and rents a separate house. She had just found out he hasn't paid the mortgage for the last 3 months which is obviously affected her credit score. I think she should see a solicitor and force a sale , but how does that actually work ? Or is there anything else she can do ?