No, Mark is the boy standing. See his dark coloring and widow’s peak. The child in Ruth’s arms should be David, the younger son (but you know what I think about “David”).
The child in Ruth's arms SHOULD be 'David' BUT IT JUST HAPPENS TO BE MARK. The boy standing is only a few months older than ZERO. Mark was born in 1964 as far as we know...after Ruth and the Kenyan went to Kenya. So where and WHEN was that darker boy born?