Peirce was devoted to his children and painted them many hundreds of times. In a letter written in the mid-1930s, Ernest Hemingway described a visit by Peirce to his home in Key West, Florida: "Waldo is here with his kids like untrained hyenas and him as domesticated as a cow. Lives only for the children and with the time he puts on them they should have good manners and be well trained but instead they never obey, destroy everything, don't even answer when spoken to, and he is like an old hen with a litter of ape hyenas. I doubt if he will go out in the boat while he is here. Can't leave the children. They have a nurse and a housekeeper too, but he is only really happy when trying to paint with one setting fire to his beard and the other rubbing mashed potato into his canvasses. That represents fatherhood."