Leondra Kruger is the daughter of two doctors. She graduated from Harvard College and attended law school at Yale University. Ketanji Brown Jackson’s father was a lawyer, and her mother was a school principal. She went to Harvard for college too and stayed there for law school. In other words, they’re pretty much like everyone else on the U.S. Supreme Court — where eight of nine justices hold degrees from Harvard or Yale — except for one thing: Kruger and Jackson are Black women. So is J. Michelle Childs. But Childs’ father died when she was young, and her mother worked for telephone companies…