You bring up a very important point that deserves clarification.
Let us clarify, then: This is not about having a right to use emotional manipulation–if you do “X”, you’ll never be welcome in MY house again!–or about shunning family members who won’t toe the line for you by cutting off contact when you find them difficult or because they’ve committed an offense against you. It isn’t about giving yourself permission to get your nose bent out of shape at every slight. It isn’t about making holding a grudge into a virtue or a form of self-preservation. No family is going to survive that. Yes, happy families make allowances for the truth that we are all human and that most of us can be real stinkers from time to time. Happy families forgive real offenses, the kind that are not “entitled” to be forgiven because the offender has some kind of excuse. Sometimes, there is no excuse, and yet we show mercy, because it is in everyone’s best interest for us to do that, even when it seems hardest for us personally.
No, this is about dealing with a habitually and seriously negative, manipulative, or abusive person who repeatedly hurts the feelings of others, violates basic social norms of polite behavior and plainly refuses to ever apologize or make any effort at amendment.
If someone has malicious gossip as her primary hobby, you ought to feel free to avoid conversations with her, even if she is your grandmother. If someone gives herself carte blanche to put you down, telling you how incapable or unlovable you are at every turn, you are free to protect yourself by avoiding her, even if it is your mother. If someone can be depended on to set one member of the family against another, it is OK for the family to get wise and refuse to be around her and her toxic ways, at least until she wises up and tries to turn herself around. If someone repeatedly shows herself unreliable, it is OK to stop relying on her. Yes, it may be a cold day in a hot place before you ever hear an apology from a family member. People have their pride, and sometimes all you get is amendment and no apology. In spite of the need to sometimes forgive without any overt bid for reconciliation from the offender, others who are the victims of the offense or their protectors still have the right and sometimes the duty to stop offending behavior by refusing to give the offender any more opportunities to offend again.
You do have a right to expect some pretense of respect from everyone in your life. It is sad that I have to say “even” rather than “especially,” since the family ought to be the cradle of charity, but I will say it, anyway: You have a right to enforce the boundaries of respect for yourself and those under your protection, even from your family. If someone is truly toxic and you have made a good faith effort to stop or re-direct or evade the toxicity without success, it is absolutely OK to “treat them as you would a Gentile or a tax collector,” even if the person is in your family. That means you are still bound to show love when you see them–to be patient, kind, never rude, not self-seeking, not prone to anger, and the rest–but you are not bound to keep them within the circle of those you trust with your emotions. You don’t have to go looking for society with them. You are allowed, even if it is your grandma, to avoid them.
Of course you are. Having children and grandchildren, sister, brothers, and other relatives is not carte blanche to dish out abuse or to play favorites or to sow discord, as you see fit. Of course it isn’t. No one ever has a right to a near occasion of sin. There should be no question about that.