Ah, MARK came to the US, with the Kenyan. Ruth?
Ruth...apparently followed the kenyan to Kenya a few weeks after he left the US and they married on Christmas Eve in 1964. (So we are told.)
We are also told that Mark was born in Kenya. So he had to have a 1965 birthdate, if he was.
Mark is about a year old in that family group photo, so it must be/probably is an image from around 1966. Right?
How old is the dark child?
Now you see TWO children in Kenya. WHERE IS ZERO?