Narrated Abu Huraira: I heard Allaah's Apostle saying, Whoever is pleased that he be granted more wealth and that his lease (span) of life be prolonged, then he should keep good relations with his kin."
[Sahih al-Bukhari, Vol. 8, Kitab al-Adab, Hadith 14 & 15 , 5985and Sahih Muslim]
[Sahih al-Bukhari, Vol. 8, Kitab al-Adab, Hadith 14 & 15 , 5985and Sahih Muslim]