It is quite possible that Nicholas Hetrick's first wife was a Brosius (maybe related closely to Christina Brosius w/o John Hetrick Born 1808). He should have married  Catherine in Jefferson/Armstrong Co., PA, .  Cahterine was dead by 1820 (first child Born 1811/12 - either John who married two Catherines or Anna Maria married Reedy said to be Daniel by descendents.  
William Hetrick b 1829 is one of the children of Nicholas and Pelli Nolf Hetrick (as are George Jackson Hetrick and Nathan Daniel King Haines Hetrick).