Isaac also had a son named William.I have kind of assumed that my Hiram was living with him in Morgan County in 1830 based on that census.I have not checked this out, nor confirmed on my own William's relationship. William is purportedly married to a Jane Cotton from western Monongahela County of VA.Hiram's brother, Reason, also married a Cotton.
From Smedley(I only have refs. from another kind source): Sarah Smedley m. Thomas Calvert (marr. and issue on pp. 121-122) 1. Joshua 2. Rebecca 3. John m. Jane, wid. of Mercer, dau. of Edward and Sarah Swayne 4. Daniel 5. Isaac 6. Thomas, d. 1781 (his will gives to brother Wm. Calvert, a mare and colt and all wearing apparel except a hat to bro. Isaac's son, Robert. 7. William, m. Jean Craig, Nov. 23, 1775.
So, this John Calvert is married to Jane Swayne.But this raises many questions which must be followed up.