Reddit mentions of Amazing Grace (Grace-picture Books)

Rather than focusing on race specifically, you can emphasize that people are different in lots of ways, and that's what makes us unique and special. Assuming your kid is young, you might read a book like It's Okay to be Different or Whoever You Are. If you do want to talk about different skin colors specifically, you could check out The Skin You Live In, Happy In Our Skin, or All the Colors of the Earth. For slightly older kids, Amazing Grace explores both race and gender when the protagonist is told by classmates that she can't be Peter Pan in the class play because she's a girl and she's black (don't worry, it has a happy ending!). Another good one is The Sandwich Swap - not about race specifically, but about cultural differences, exemplified by different foods.