My MIL wasnt married to my FIL, and, it caused no end of trouble. Everyone pressumed as they had been together 26 years, shed get everything. Joint credit card had to be closed, she couldnt get a grant for the funeral, all his belongings went to DH (but we arent taking them, its just on paper), has no claim on his pension, she couldnt even own his grave, or order the headstone. She had only been on the house deeds a little while aswell, but thank god she was as thta would have been a total nightmare. There is just no such thing as common law husband and wife, and, alot of people dont realise that. Things were made more complex by the fact she changed her surname ot the same name, so alot of things were addressed to Mrs., and she just went with it.
YG - ((hugs))