the cobbler's children are the worst shod

proverb Someone who is busy using their skills for the sake of other people often neglects to look after themselves or their family. A: "Isn't their mother a seamstress? Why are their clothes always so tattered?" B: "Well, you know what they say—the cobbler's children are the worst shod." My father is one of the top architects in the world, designing some of the most extravagant and innovative buildings in existence, yet we still live in this pokey little cottage. The cobbler's children are the worst shod, I guess.