Musannaf Ibn Abi Shayba 13:2742

Abu Bakr narrated to us, he said: Ibn Abi Za'idah narrated to us, from Dawud ibn Abi Hind, from Sa'id ibn al-Musayyib, he said: The father may eat from the wealth of his child whatever he wishes, but the child may not eat from the wealth of his father except with his (the father's) good pleasure.