This article has a fairly extensive discussion of Henry and James Leonard, citing many documents. There are over 300 references.
"An undocumented source indicates that Henry’s wife’s maiden name was Mary Russell and that they were married in Lynn. If this is true, then the next assumption might be that she was a sister or daughter of Ralph Russell. This Ralph Russell was a less-experienced forge helper with Henry and James Leonard at Hammersmith (the name of the ironworks at Lynn). [citation: E. N. Hartley, Ironworks on the Saugus (1957), 100-109 and Richard S. Dunn, Puritans & Yankees: The Winthrop Dynasty in New England (1962), 87-90.]"
Apparently, Mary was brought up on charges several times for being uncivil and swearing. Several examples are given on this page.