I have George Rees(b. 1802) m. Martha Loewellyn listed as "my" James parents. i have not spent any time to confirm or deny this connection. If memory serves me right I got this info from Gilberts daughter and her name slips me at the moment. Her last name is Patton.
I will try and see what I can find with your lewis and the family. At this point they I can not connect you to the line I am researching but ifI find anything I will be sure to let you know.