Ida M. Gates, 1869, Iowa

Ida M. Gates, born 22 Jul, 1869 in Iowa, married Charles O. Beitzell, 11 Jun 1889 in Iowa.The 1870 Swan, Marion, Iowa census gives age as 1, born in Iowa with John (age 61)and M.A.(age 57) Gates as her parents; however, that is a bit old to have a 1 year old child, so I am wondersing if she was their grandchld instead.the 1880 Swan & Union Twp., Marion, Iowa census give age as 10 living with parents (John and Mary).Hopeing someone knows who Ida's parents were.