The Prophet, sallallahu ^alayhi wa sallam, said:

لاَ يَدْخُلُ الْجَنَّةَ قَاطِعٌ

 La yadkhulul-Jannata qati^.

This means: “The one who severs the ties with the relatives will not be among the first to enter Paradise. Rather, this person will enter it after being tortured in Hellfire (i.e., if one dies as a Muslim).” (Narrated by al-Bukhariyy.)

Maintaining the ties of kinship: Kinship includes the relatives: aunts, uncles, and their children.

 A Companion asked the Prophet:

مَا النَّجَاةُ يَا رَسُولَ اللهِ، قَالَ: "تَصِلُ مَنْ قَطَعَكَ وَتُعْطِي مَنْ حَرَمَكَ وَتَعْفُو عَمَّنْ ظَلَمَكَ