Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: Regarding whom the Messenger of Allah (peace and blessings be upon him) said, "If I were to take anyone as a close friend (khalil), I would have taken him (i.e., Sayyiduna Abu Bakr, may Allah be pleased with him) as a close friend, but Islamic brotherhood is superior." He said: Grandfather is like a father.
Hadith Referenceسنن دارمي / من كتاب الفرائض / 2944