Yes George and Elizabeth are the parents of Mary who married John Sweigert. See Lancaster Co. Deed Book 16 page 296 where the children of George Mundorff sign a release that they have received the allocated money from George's oldest son John as he will get George's property and the other choldren get their share in cash from John. John Sweigart and his wife Mary got 200 dollars by 1812 and it was recorded in 1818.
The Burkholder's ran a ferry across the Susquehanna and eventually the Mundorff's bought land in York County Iwond if that's how Mary met John Sweigert.