I agree 100%, we aren't gaining anything by glossing over slavery with children at early ages. I know there's a growing body of children's books that discuss slavery. You could try Never Caught: The Story of Ona Judge (children's version) while you read Never Caught: The Washingtons' Relentless Pursuit of Their Runaway Slave, Ona Judge (adult version). It's a phenomenal book, and really cool that she produced a children's version along side it.