Abdullah ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, said, “Whoever would like to maintain relations with his father in his grave, let him maintain relations with his father’s brothers after him.”
Source: Ṣaḥīḥ Ibn Ḥibbān 432
Grade: Sahih (authentic) according to Al-Suyuti
عَنْ عَبْد اللَّهِ بْن عُمَر قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَنْ أَحَبَّ أَنْ يَصِلَ أَبَاهُ فِي قَبْرِهِ فَلْيَصِلْ إِخْوَانَ أَبِيهِ بَعْدَهُ
432 صحيح ابن حبان كتاب البر والإحسان باب حق الوالدين
8302 المحدث السيوطي خلاصة حكم المحدث صحيح في الجامع الصغير