Legal Question in Wills and Trusts in California

A deed of trust is not a deed TO them. It is essentially a mortgage document granting a right to the lender to become the owner through foreclosure if the debt is not paid. It is impossible to do anything more than guess at what their ownership interests were or are from that document. It could be they acquired the property together, as a married man, sole and separate, and an unmarried woman, which would make them co-tenants in equal shares. Even if that is correct, which it may not be, unless they both died at the same time, such as in a car crash, what portions go to what estate depends on who died first. Without knowing what the original deed to him (and her?) says, and who died when, you can't even really start this analysis.