As a programmer, I was wondering too long whether the joke was, that the tree is the wrong way around (grandparents are the root of the tree). Yes, that is our kind of humor...
how to produce the sickest jawline in history
Very tightly knit family.
Less "tree" more "pile".
Bottom row looks way more diverse than I'd expect.
Based on her kids' hair color, I'd say Marle has been introducing some other genes into the pool.
I believe red is resssive so if both parents were heterozygous for hair color it would be possible.
The royal family be like: