I’m will not say you’re wrong, but I am skeptical about the kid on the right.
He looks 100% Euro-American to me, with nothing in his features that is either African or Hispanic/Indian. He could be German or English ancestry by appearance. The SS would have been happy to take him.
The middle kid obviously has considerable white ancestry. He also has “crazy eyes.” The other two just look stupid.
Look at his lips and his hair! He has that curly kink to his light-colored hair that tells me he’s mixed. He’s got the thicker lips as well. Do a web search for mulatto or mixed-race children, and you’ll see what I’m talking about.
His father, however, is definitely black.