It is unlikely that John married 3 times, but rather that the 3rd Family Page - Family:John Gregory and Unknown (5) - should be merged with one of John's other Family Pages. Please see note on Ref #4 below. --Cos1776 20:38, 16 August 2014 (UTC)
... II. John Gregory, 2d. Children: John 3d. Perhaps others. ...
[cos1776 Note: this reference does not give any information about this John Gregory the 2nd other than he is the son of John (d. 1689) Gregory and his wife Sarah Unknown and that he is the father of John Gregory the 3rd who married Mary Smith. It does not say which wife of John Gregory the 2nd is the mother of John Gregory 3rd. I will leave it up to someone with some better evidence to merge the duplicate families once it is determined.]