According to the book "The Ark and Dove adventurers" by the Ark and Dove Society, the list of children of William Calvert and Elizabeth Stone Calvert are as follows:

1. Charles Calvert (b. 1662)

2. Elizabeth Calvert (b. 1664)

3. perhaps William Calvert (b. 1666)

4. perhaps George Calvert (b. 1668)

5. perhaps Richard Calvert (1670-1718)

Joshua Calvert (1674-1733) is not listed. His mother Elizabeth, if b. c1644 is correct, would have been 30 at the time of his birth, so it's within the realm of possibility, but no record exists showing the birth, not even with the Ark and Dove Society.