Charles Gilbert's brother, Marvin LeRoy Gilbert, was my paternal grandfather. Milton had 11 children! My father may have some family information that might help you, as we were reconnected with this side of the family in the 1980's. There are a lot of Gilberts in North Florida with some interesting history.

This family tree may help you too.
https://www.msu.edu/~lipsey/html/fam03767.htm