There is a Daniel Stewart listed as a child age 12 in Lee Co. in 1870. This fits with the dates you have for him. He is listed in the home of James Stewart age 64, Mary Collins age 50, Lenty age 26, Jane age 24, Daniel 12, Julia A. age 17, Caldenia age 8, Margaret E. age 14 and Sarah Goin age 70. James was born in Lee Co. and Mary Collins was born in Hancock Co. The 1870 census does not state relationships, so it does say if Daniel is a son or a grandson. This is Jonesville Township family 52, 1870 Lee Co. It might be your Daniel. You may want to investigate who the other people are to help determine relationships.