There is a John Upton in the Salem birth records as a parent that time-wise matches this person quite well, so the records and connections are based on him. [1]
Records
Births of Children:
UPTON, James, s. John and Ellenor, Sept. ––, 1660. CTR [2]
UPTON, Issabbell, d. John and Ellenor, 3: 11m: 1666. CTR [3]
UPTON, Joseph, s. John and Ellenor, Apr. 9, 1670. CTR[4]
UPTON, Samuell, s. John and Ellenor, Oct. ––, 1664. CTR [5]
UPTON, William, s. John and Ellenor, June 10, 1663. CTR [6]