Leonard and Eleanor Pattee's whereabouts.

Hiram Pattee of Summerfield Township, Monroe County, Michigan and his wife, Cecelia Sheldon were the parents of two children listed on the 1870 census. Leonard, also known as Bert, born about 1868 and his sister, Eleanor (Ella) born about 1862 in Petersburg, Michigan. My great-grandfather, Nelson Sheldon was listed as a servant in their household.I would so like to find any knowledge of this family. Thank you.