Robert- It is possible Peter is Martha's father. Peter (Frederick's son) volunteered and served in the Rev. War militia, as did his brother, Daniel. Peter (b.1760) and Daniel(b. 1759) left Sussex Co. after the war for Northumberland Co. Pa. in 1788 or 89. D DanieL lived in the modern-day Northumberland Co. throughout his life in Chilisquaque Twp. Peter lived in Columbia Co. Mt. Pleasant Twp (Fishing Creek Twp. and North Co. Greenwood Twp.) In the 1790 census Peter has 2 sons 16+, 2 sons under 16 and 3 daughters (no ages). Martha could have been in his family at that point. In the 1800 census he has more children, 3 males 16-26, 2 males 10-16, 1 male under 10, 1 fm. 16-26, 1 fm. 10-16 and 1fm. under 10. Martha would not have been included in this census since she married in 1797 . It would be helpful to know where exactly she and Daniel moved to in Columbia Co.. We know that in the 1820 census Peter's two sons Peter and Daniel both live in Bloom Twp. Col. Co.. In the 1830 census Peter is living with his son Peter in Mt. Pleasant Twp. Peter's grandson David (son of Peter) lived in Catawissa Twp. in 1830. It seems the Eveland's had little imagination when naming their sons. John, Peter, David, and Daniel are used continuously to the present day even. It makes it very difficult to trace your lineage. Martha probably was Peter's daughter and sister to Peter and Daniel. Keep in mind that there were 6 sons of Frederick. Two (Daniel and Peter) came to Northumberland Co. Pa. John stayed in N.J. George went to Ohio or Canada, Samuel stayed
in Phila. Pa and Frederick Jr. (the youngest son) I do not know about. Martha might have been Daniel's daughter also. We can not find any info on Daniel's wife or children. Good Luck.