Matt Clinton plays a pivotable role in the Gibbons-Walshe family history. When Anne Genevive (Nan) Walshe wanted to leave Mexico she visited friends and relatives in Alabama. Among them was Matthew William (Matt) Clinton. Matt and Nan were second cousins. That is, they shared a great-grandparent.
The chart below shows that Matthew Clinton (1785-1853) was the great-grandfather of both Nan and Matt.