According to the website Manghaughwont was born in Mohegan, New London, CT, but there is no year listed. He married an unknown Native American woman. There first child was EPHRAIM2 JOHNSON, d. July 29, 1749, Montville, New London Co., CT. I think the child may have been still born.
Their second child was Joseph Johnson (JOHN JOHNSON, b. Mohegan, New London, CT; d. Bef. 1766, Groton, Connecticut.) Joseph later became famous.