Zirr bin Hubaysh said: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said to me: "Do you know what hafadah are?" I said: Yes, they are a man's children and his children's children. He said: "No, they are the in-laws."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9059