Thank you, yes he could have died. I can not find George Johnson there are quite a few george Johnsons back then.
The census says he was born in Iowa I have tired to fine him as a child, and even when he was married but so far have not found him. My aunt told me years ago when I first started looking, that she had heard they wee on a wagon train coming to Texas and everyone died. She was my Dad's older sister. In the 1900 census it just shows 2 sets of twins but there were 3. My Grandfather was Jesse James Johnson.