I know I am responding to this writing two years later, as I also am a relative of George and Susannah Martin. The research I found is Christopher had only one son Nathaniel Martin and I am trying to get more information as I write this. Nathaniel was baptized in 1609 in Billericay England and did not come over on the Mayflower. He may have come over later, and I am also researching this. His father Christopher died the first winter. He was only 42.
I am examining the ship lists to see if and when Nathaniel came over later.
Christopher was the governor of the Mayflower and 9th signer of the Mayflower Compact.
Will write more when I learn more.