From the 1870 US Census for the Village of Eaton Rapids, MI, Page 6, #49:
Robert P. Abbey (Abby) 44, Male, White, Harness Maker, Real estate $2,000 Personal $300, Born New York
Sarah, 33, Female, White, Keeping house, Born Ohio
Edwin 2, Male, White, Born Michigan.
[Note: This information indicates that Robert P. Abbey was born when his mother was 13 years old. Wrong person? Wrong dates somewhere? Further research is obviously needed].