OK, this was my thoughts also .... I just was not sure that could happen as I kind of thought today they would 'track you down' if you turned up missing, but maybe not especially then ..... I had my grandfather with his father in 1900 census, then I had their marriage license for 1904 in Madison County, then I had their 1st born in Madison County in 1906 and the next 3 sons born in LaGrange, Indiana 1911, 1916, & 1918; and I just looked at the 1920 census they were in LaGrange, Indiana and 1930 census back in Madison County, Indiana. So they must have missed the 1910 census altogether and were in transit about that time. apparently they were in LaGrange from about 1907 to 1910 till sometime between 1921 to 1930 census at which time they had come back to Madison County, IN.
Thanks so much for your help .... I appreicate it.