Tara The most recent David Gibb I have in my records is David W. Gibb, born in March, 1858, in Sewickley, and died 11 Jan 1938. He was a son of Washington Gibb and Mary Devillin. Washington was one of the sons of David Gibb Jr. and Margaret Sisley. This David might have had a son David(your grandfather). My relative was David Gibb Jr.’s son Daniel. I am fairly sure there are no Daivd’s in his line. David Gibb Jr.’s other son is George C. Gibb Sr. There might be a David of your grandfather’s generation in that line.