Your family names comes up Fenstermacher from the Bechtel book of 1936 at the Bethlehem Library. I show Mathias, Philip, Peter (1759-1841), William. Other children of Peter with additional info. I am missing one child. I also have gotten help from the Allentown, Pa. newspaper obit listings
1986-2001. I copied 123 pages from the Bechtel book and still have hundreds to go - the book can not be photo copied.