Jami` at-Tirmidhi Book 27, Hadith 7
the Prophet said: "Among the most dutiful of deeds is that a man nurture relations with the people his father was friends with."
the Messenger of Allah said: "It is among the greatest of sins that a man should curse his parents." They said: "O Messenger of Allah! Does a man curse his parents?" He said: "Yes. He verbally abuses the father of a man, who in turn, verbally abuses his father, and he (retaliates and) curses his mother , so he curses his mother."
the Prophet said: "The maternal aunt holds the same status as the mother."