فَهَلْ عَسَيْتُمْ إِن تَوَلَّيْتُمْ أَن تُفْسِدُوا۟ فِى ٱلْأَرْضِ وَتُقَطِّعُوٓا۟ أَرْحَامَكُمْ ﴿٢٢﴾
假若你们执政，你们会不会在地方上作恶，并断绝亲戚的关系呢？
Haram Family & relations
Is cutting off family ties haram?
Short answer
Yes. The Quran warns that those who cut what Allah ordered to be joined are cursed (47:22-23, 13:25). Keeping ties includes visiting, greeting, helping and forgiving relatives, even when they are unkind.
Evidence
Quran
أُو۟لَٰٓئِكَ ٱلَّذِينَ لَعَنَهُمُ ٱللَّهُ فَأَصَمَّهُمْ وَأَعْمَىٰٓ أَبْصَٰرَهُمْ ﴿٢٣﴾
这等人，是真主所弃绝的，故他使他们变聋，使他们变瞎。
وَٱلَّذِينَ يَنقُضُونَ عَهْدَ ٱللَّهِ مِنۢ بَعْدِ مِيثَٰقِهِۦ وَيَقْطَعُونَ مَآ أَمَرَ ٱللَّهُ بِهِۦٓ أَن يُوصَلَ وَيُفْسِدُونَ فِى ٱلْأَرْضِ ۙ أُو۟لَٰٓئِكَ لَهُمُ ٱللَّعْنَةُ وَلَهُمْ سُوٓءُ ٱلدَّارِ ﴿٢٥﴾
与真主缔约，然后加以破坏的，断绝真主命人连结者的，在地方上进行破坏的，这等人将被诅咒，将吃后世的恶果。
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Is cutting off family ties haram?
Yes. The Quran warns that those who cut what Allah ordered to be joined are cursed (47:22-23, 13:25). Keeping ties includes visiting, greeting, helping and forgiving relatives, even when they are unkind.