My wifes family is Mahaney, but I have never the name of Marvin. Her father is Clyde Mahaney, his father Henry Mahaney, from Birchtree area, Shannon County, Missouri. We have some info, but not much! The Mahaney famuly came from Ireland, we think, and the other side of the family was Pettijohn, from France. My wifes father was Clyde Mahaney, lived and died in Springfield, MO.