Yazid bin Zuray' narrated the hadith with his chain that a Bedouin came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah! I have a son and I also have wealth, and my father wants to take my wealth. He said: "You and your wealth belong to your father. Your children are your purest earnings. Eat from the earnings of your children."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15750