Hadith 10:1461
Abu Bakr narrated to us, he said: Mu'adh ibn Mu'adh narrated to us, he said: Ash'ath narrated to us, from al-Hasan, that he used to hold the son of his son responsible [for maintenance] if he was poor and the grandfather was wealthy.
حدثنا أبو بكر قال نا معاذ بن معاذ قال نا أشعث عن الحسن أنه كان يلزم ولد ابنه إذا كان فقيرا وكان الجد غنيا