More than likely, Doris did not have a social security number. Many
women of that time period never applied for one as they "only" worked in
the home and didn't receive a salary. They were relying of the
husband's social security pension.
If you believe that the notice about the cousin dying is the right one,
you could try to get additional info through the obits in Redwood City,
CA. He may have descendants who have info. Try for an obit for him.
That should also state the funeral home that handled his funeral.
Funeral home records are great. They usually state the minister who
officiated (leading to a church affiliation) and surviving family
members. Most funeral homes charge a very small fee for copies of
funeral records. I've had some for free and up to $5 per record.
Again, these are just suggestions. They are ways I've been able to
locate information for my family tree.
Lois