And a bit more - searched for James Aylward Develin on the internet and came up with this.If this is your grandfather it appears he was very well-to-do.Probably why your mother had to give you up - to keep the family name from scandal.Here's the info:
Roster of Volunteers of the American Field Service in France, 1915-16-17
Names of Officers are printed in heavy type, names of men who died or were killed during the War in italics [or underlined when linked to the Memorial Volume]. The decorations indicated: Croix de Guerre †, Légion d'Honneur *, Médaille Militaire †† ) were those received by the members while still volunteers of the Field Service. Decorations subsequently received are not included.
Name SectionPeriod of ServiceHome AddressCollegeSubsequent Service
Develin, James Aylward, Jr. S.S.U. 136 months 1917Philadelphia, Pa.Wesleyan U.S. Navy