My best friend and her husband are buying a house. They rented for a bit after selling last house. The new mortgage is to be I her husbands name only due to her having a poor credit rating. Today she told me that as she's going to live there she has had to sign a form saying she as no claim on the house should they split up. If I've understood correctly this has been as part of the mortgage agreement. Is this usual? I've not come across it before and it seems extreme?