BANG in MS.

Looking for the family of Amanda Olivia Bang from Vancleave, MS. who married Sylvester Waltman(not from Vancleave). Not sure of Where Sylvester is from. I am their great granddaughter. Their daughter, Grace (Waltman) Carroll was my Grandmother. Grace is 86 yrs. old an unable to give much info. Anyone know how to go about finding these people?? Thanks!