I have DNA links to these people listed as siblings to Elizabeth Johnson b.1735-1740 in Pennsylvania, including Elizabeth, Martha, Allen, Micajah and Parthenia. Their age differences are more in line with being children of hers rather than siblings, plus, they are from South Carolina. The marriage to Samuel Gamble shows Elizabeth to be around 30 years old in a time when it was common to marry at age of 15. I'm beginning to suspect Elizabeth was not born a Johnson but was previously married to a Johnson and lived in a different state at that time and these siblings really are her children. Speculation.