A father carries pictures where his money used to be.

The joke turns on a small, concrete detail—the contents of a wallet—to express a larger shift in priorities. “Where his money used to be” suggests both literal expense (children drain disposable income) and a symbolic replacement: affection and identity take the place of financial self-concern. The father’s “pictures” function as portable proof of attachment, pride, and responsibility; they are what he chooses to carry closest. The line’s gentle humor softens a serious point about parenthood: love reorganizes a person’s values, and the costs of family life are inseparable from its emotional rewards.