In the 1870 Federal Population census Percy was recorded being 9 years old at Lebanon Township, Clinton County, Michigan, Isaac Fifield age 41 born in Vermont, and Hannah Kinkaid 70 born in Vermont. She is likely Percy's grandmother. In 1870 Percy is 20 years old, Seldon is 24, and Emma age 1.
In 1860 a James Seldon, age 15, is attending school, living in Walled Lake, Novi Township, Oakland County in the household of Thomas 33 b. MA and Sarah McGraw 36, born in Massachusetts.
I hope this helps.