the Prophet said: "Among the most dutiful of deeds is that a man nurture relations with the people his father was friends with."  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِنَّ أَبَرَّ الْبِرِّ أَنْ يَصِلَ الرَّجُلُ أَهْلَ وُدِّ أَبِيهِ قَالَ وَفِي الْبَابِ عَنْ أَبِي أَسِيدٍ