I have considerable info on the Robert, Lawton, Maner, Mosse, a little on the Singleton and Oswald families. There are also the Erwin and Bostick families that are connected to the Robert family.
The best singular source is Miller's Our Family Circle. I think you can get it on ebay.You will go absolutely crazy trying to figure out all the relationships.
Another excellent and unbiased source is The History of Beaufort Co, SC Volume I by Rowland, Moore and Rogers. It was published by the University of SC Press in 1996.If your library does not have it, they will probably get you a copy on inter library loan.The same goes for Our Family Circle.
My great, great, great grandfather was Capt. William Maner. One of his daughters married a Lawton, one married a Bostick, and one married a Martin.The families married each other for a period of at least 75 years.