I was watching Star of Midnight (1935) starring William Powell and Ginger Rogers (great movie by the way) and Ralph Morgan appeared in a scene. I thought he looked a lot like Frank Morgan and I remembered noticing the name Morgan in the opening credits. I looked him up on IMDb and sure enough I was right! His real name was Raphael Kuhner Wuppermann. Frank was born Francis Philip Wuppermann, the youngest of 11 children.
I love learning about celebrity siblings and relatives. It's always cool to see which one was the bigger star, especially when it's the younger sibling following in the steps of their older sibling, as the case is here.