Peter married Annis Amelia Knickerbocker on 22 Sep 1853 in Wawarsing, Ulster County, New York, USA. Annis (daughter of John Orange Knickerbocker and Mary H. DeWitt) was born on 1 Feb 1834 in Wawarsing, Ulster County, New York, USA; died on 29 Mar 1910 in Highland Corners, Elk County, Pennsylvania, USA; was buried on 31 Mar 1910 in Pine Grove Cemetery, Ridgway, Elk County, Pennsylvania, USA. [Group Sheet] [Family Chart]

1. John H. Irwin was born in 1854 in New York, USA; died in 1940.
2. Calista E. Irwin was born in 1856 in New York, USA; died in 1881.
3. Emma Blanche Irwin was born in 1857 in New York, USA; died in 1939.
4. Dora Myrtle Irwin was born in 1860 in New York, USA; died in 1898.
5. Rev. Daniel Columbus Irwin was born on 14 Nov 1862 in Kingston, Ulster County, New York, USA; died on 9 Mar 1939 in Kendall, Orleans County, New York, USA; was buried on 13 Mar 1939 in Riverside Cemetery, Rochester, Monroe County, New York, USA.
6. Florence E. Irwin was born in 1867 in New York, USA; died in 1935.
7. Warren Peter Irwin was born in 1868 in New York, USA; died in 1891.
8. Ebba Irwin was born about 1874 in Pennsylvania, USA.
9. Ermina Edna Irwin was born on 28 Jan 1878 in Ridgway, Elk County, Pennsylvania, USA; died on 9 Apr 1933 in Forest County, Pennsylvania, USA; was buried in Apr 1933 in Starr Cemetery, Church Hill, Forest County, Pennsylvania, USA.

William + Johanna Helm Osterhout. Johanna was born about 1804 in New York, USA. [Group Sheet] [Family Chart]