No one's sure who my father was, so I can't speak to that, but.....
As for my mother's family: My grandmother was raised on a reservation, had very little education, and did farm labor. My grandmother died the day after giving birth to my mother, and my mother and her siblings went to an orphanage where they did farm chores. My great-grandfather had very little schooling and did farm labor. My grandfather went to school until the 8th grade (all that was required, I think, in those days), while simultaneously working on the farm. When he was about 16, I think, he started work on the railroad----apparently getting women pregnant, all up and down the line----and stayed there, the rest of his life----well, until retirement. He did, eventually, re-marry, and then my mother and her siblings were able to leave the orphanage and live with him.