Hattie Petty Mumford and Metta Petty Mumford

Looking for descendants of my grandfather's, William Andrewsen Petty, sisters, Hattie and Metta Petty who married Mumfords.They were born and lived in SC. They were the daughters of Samuel Davidson Petty and Emily Petty Petty.Their nephew will be turning 100 next year and we would like to get in touch with the family.