NameSarah Cunningham 
Spouses
Birth1828
Memo(age in Census)
Birth, Parent-Proof, Designation notes for William (Spouse 1)
I believe the John and Rebecca Martz who died in 1849 and were buried in Montgomery County, IN were the same John and Rebecca who married in 1827 in Pickaway County, OH. From the 1840 Census, it is clear they had a family and I believe the remnants of some of their family were still living in Montgomery County in 1850. The household was headed by the very young William Martz born 1828. Besides his wife, we also find Abraham, Isaac and Jacob Martz, ages 12, 8 and 8 respectively.
In 1850, Samuel Martz (John’s bother) was appointed guardian of John’s minor children including sons Abraham, Isaac and Jacob — proving that William too (older so not needing a guardian) must also have been John’s son.
William is designated P5b1a.
Relocated and Census Tracking notes for William (Spouse 1)
In 1860, he was still in Montgomery County with wife Sarah and now a daughter Amanda R. Age 8 and then I lose track of him.
Death and Find-a-Grave notes for William (Spouse 1)
I see no signs of William on find-a-grave as of autumn 2021.