...yet is passed through the mother's side (ie skipping a generation each time). As I've found, sadly - my wife's dad used to sing the colourblind-version of "I Can Sing A Rainbow". The one which goes "Brown and Brown and Brown and Brown... Br-ow-n and Br-ow-n and Brown"...
It appears my son may have to learn the same song, although he's too young to take the test yet, apparently.
