I think I can actually shed some light on the Delfosse/Benn research you are doing, if you have this information already then hopefully it can be of some use for someone else.
Olive Benn and Desire Delfosse, had 5 children, all born in PA, they were Joshua, James, George, Ella M and Violet.
The boys all passed away in there 50's I was told and Violet passed on when she was very young and Ella M passed in August 21, 2001.
I am the granddaughter of Ella M Delfosse (Waite)and Great Granddaughter of Olive Benn and Desire Delfosse, Ella Mae was married to Robert Andrew Waite (of PA also) on july 8, 1938 and they had 8 children.They were living in the Cleveland, Ohio area most of there married life.
I hope this helps and if anyone has information I would greatly appreciate the help.