According to my info in the Fretz Family Book Vol III, Martin, b 1709 near Frankkfurt-on-Main, Germany came to America as a youth, died 4-5-1744.He married Agnes ???, settled in Bucks Co. Pa. They were Mennonites. His oldest son was Martin, b 2-5-1739, d 3-5-1813, married Anna Beitler, daughter of Jacob and Anna Meyer Beitler.He had 2 children, Agnes, Maria, Jacob, Annie, Martin, Barbara, Elizabeth, Henry, Sarah, Abraham, Christian, and Susanna.
I am searching for info on my gggg grandmother Barbara Oberholtzer, born in 1757, married Christian Fretz, had son Isaac Fretz. I don't think this is the Barbara above because Henry would have been only 18 years old.
There is not much more info spread around in this book, but probably is in Fretz Family Vol I or II, which I don't have.