I am sorry that I do not know about George Madison Crews. I do know that the Crews, Lightfoots & Darnells were (and are still) in Dunklin Co. MO & in Mississippi Co, AR. My g g grandfather, Joseph(?) Crews married a Bettie (Elizabeth Ann)Darnell. He was originally from NC & she was from TN. I have not found them yet in the census records. I would also look at Dyer Co. Tenn, Pemiscot Co. MO & Hardeman Co, TN. Hope you can find more info. There were LOTS of Crewses around the Missouri bootheel from early 1800's. Good Luck- Gwyn Wood