Jan- I would like to help if I can.I am a descendant of Rev Andrew.
I do not show a Mary from Robert James Jr (1686) marriage to Mary Thompson.Perhaps he was married before he married her in 1727 as he was 41 by then.If so it would fit. She would be aunt to his brother's sons. Andrew (1692 or 1702) was his brother and had sons named John and Cuthbert. Many show the Rev Andrew to be the son of Andrew (1692 or 1702) but his father was James (1729) Andrew's brother. This was proven by DNA through Jack M Baker.Hope this helps.Let me know what you decide. JB