We need to find a death certificate for Marvin, but it sure looks like he was the son of Nellie. But was Walter English his father?What is interesting is that in 1920 Nellie is listed as 28 years old and not married or widowed, while in the 1930 census she is 37 and listed as married at age 25.Walter is listed as age 39, and married at age 27 (or 37?).These "age at marriage" dates would, of course, take care of the age of Marvin (11 in 1930) making him "legitmate" in this family. Other info on line lists Walter English as born 14 Sep 1889, died 4 Jun 1969. Nellie is listed as b. cir 1893.(This is obviously based on the census reading of 1930, but also supports her age in 1920).