The people in Frank McCallister's family group photo dated 1907 are as follows: 
Front row, left to right -- Levi (infant), Inez (standing), Anna (infant), Garnet (standing)
middle row, left to right -- Sarah (mother), Thomas (father)
back row, left to right -- Virgil (standing), Maggie (standing), Frank (standing)

The four children in the photo are Frank McCallister's children in 1936:

left to right -- Laird Lee, Garnet, Edward Herbert, Sarah Ann (child in front)