Looking for Descent and Information Regarding Doreen Edith Biddle and Theodore Joseph Keith

My Grandma's brother was Theodore Joseph Keith, he was married to an Doreen Edith Biddle. They had one son who died in 1966 (I believe in a car accident).

My Grnadma lost contact with her brother some years ago. We know that they have both past on via newspapers, but I would love to get in contact with a relative, most likely from Doreen Family.