Several times my family has tried to find my great grandfather's past. He was orphaned in Wyoming (1880's) when his parent's wagon was in an accident. He had a sister...noone remembers her name. He was sent to live with a local man who treated him badly and he ran away. He made it to Minnesota and eventually married Effie Fischer. Any ideas on how I can find out more? I would be grateful. It is believed he was Native American..possibly Chickasaw.