At the age of about 26, Roger married Mary Bernard on December 15, 1629, in High Laver, Epping Forest, Essex, England when she was 20 years old.

Mary Bernard was born in London, England, on September 24, 1609. Mary’s last name is sometimes given as Barnard, but according to many historians, she was the daughter of the clergyman, Richard Bernard. Mary was a maidservant in the nearby grand estate belonging to Lady Joan Barrington. The couple was married in the church of High Laver.