Hadis al-Rasool ﷺ

The Prophet (peace and blessings of Allah be upon him) said: "The one who severs family ties will not enter Paradise!" Meaning, treating relatives badly is an extremely grave sin; no person can enter Paradise with the filth of this sin. However, if he is punished (for it in Hell first) or is granted forgiveness, then that is a different matter. (Tuhfat-ul-Qari)