John Willcockson married Daniel Boone's sister, Sarah, in 1742 in or near Berks County PA. John had a brother named George. It is possible that he also had a brother named Isaac. The identity of John's parents or his place of birth have not been conclusively proven even though researchers have sought to do it for, at least, 75 years. If you can, please help solve that mystery (excluding reference to Dorothy Wulfeck's book). Reg Wilcox