Elizabeth Sloan [b. 1787] married a Henry Brewer [b. 1780] and they lived in both Fayette Co., and Somerset Co., PA. Both of them were probably born in MD if the 1850 census is correct. Henry Brewer is mentioned as John Sloan's son-in-law in his will filed in 1833 in Salisbury, PA, where John died, after owning farms in Fayette County [Henry Clay Twp.] and Allegheny Co, MD. Does this Henry tie in with your Brewers?