Mack was the son of Willie who died young. Her younger sister Aunt Hattie came to take care of the young children. Uncle Bob didn't think it was proper so he married Aunt Hattie.
Can You Trace Your Line To Robert Lilly ? Yes, to several Roberts, but that three century nonsense was the "work" of fraud Gustav Anjou.
So far I have had no luck in obtaining any pictures of Mack in uniform, or copies of any needed documents. Do you have any suggestions for contact along those lines?