Left to right:
Mrs. Thompson
Frances Sumner
Marion Chapman Knight
Fannie Tutt Williams
This is one of four photos from this trip in the collection.
Marion Elizabeth Chapman (1917-1963) is great-grandmother of MKS in the Knight branch.
Frances (Fannie) Tutt (1858-1944), grandmother of Marion, is 3rd great-grandmother of MKS in the Knight branch.
References:
[1] KMS Family Genealogy Digital Archive, Jacqueline Anne Knight Spratlin collection (photograph).