He passed in 1963. He had worked for the RR, so he wasn't entitled for SS benefits.
I met once (sometime ago) with a gal who would have been Dad's niece and showed her the pictures I had of him and she had no idea who he was. She didn't have any idea what had happened to one of her uncles either. The family was quite dysfunctional.
I'm on another angle....There was a Jackson Whitfield Grimm born in 1913 in Shelby County, Alabama and in the 1920 census living with his grandmother. She died in 1921 and I've not been able to find out what happened to the boy. I just received an address of a person in that county who might be able to tell me what happened to the Grimm's in that area.
I may repeat myself here, but Dad talked about being in the army as a cook. Based on his physical condition he was not draftable in the regular army, so I think he was in the WPA program and met one of the sons of the family Dad later claimed as his own. As for the reason, that's an unknown.