Patrick, a descendant of Francis Pettitt contributed the following information:
Francis Pettitt, b1612
Francis Pettitt, b1636
Francis Pettitt, b1663
Captain Francis Pettitt could also have been a Captain in militia. I have seen literature that says Francis Jr fought in Indian wars in 1600's. Plus, Obedience Robbins (think he was also a Colonel) and Colonel Edmund Scarborough held ranks due to militia service.
First Pettits in America Series #7 -Francis Pettit Virginia 1630s
A Francis Pettit was born around 1612 and was living in Northampton County, VA as early as 1636. He owned a plantation near Cherrystone Creek on the Eastern Shore. He was married to a woman named Ann and had at least one son named Francis. He was also related in some manner to Obedience Robins.