He is insisting that his father be able to visit so that he can meet the baby.
Is your husband willing to handle the visit by himself? If not, what are the ground rules for how he’s going to have your back during this?
You can survive this. You can survive being around someone who has been insulting in the past or who makes excuses for someone who is. You can hardly be on intimate terms, but you can be on civilized terms. You can manage to have the kind of interaction you’d have with a total stranger.
The question is how to refuse to let the elephant sit on your chest during this whole thing. I’d say it is this:
If your brother sins [against you], go and tell him his fault between you and him alone. If he listens to you, you have won over your brother. If he does not listen, take one or two others along with you, so that ‘every fact may be established on the testimony of two or three witnesses.’ If he refuses to listen to them, tell the church. If he refuses to listen even to the church, then treat him as you would a Gentile or a tax collector. Matt. 18:15-17
Is a tax collector someone you are not polite to? No, you still have to be civil to everyone. You have to love your enemies. To a Christian, an enemy is someone you are on formal terms with, someone you treat with kindness but not someone you put in a position of trust. The Lord thirsts for the repentance of our enemies, too, after all. Until then, it is a work of patience.
Yes, you can make yourself scarce and you can also leave or have your husband ask your FIL to leave, if he doesn’t behave according to your boundaries. (If you remember, Our Lord sometimes made himself scarce when dangerous people were looking for him and his hour had not yet come. That is OK.)
Try hard to make this as small a thing as you possibly can. Remind yourself that when you accept they have little affection in their hearts to offer you, that they are inflicted with insensitivity for reasons you don’t fully know, there is little your relatives can really do to harm you. If you do not expect them to be sensitive, if you remind yourself that you can pass over their poor choices of how to act, their clumsiness will do less harm.
To forgive injuries and to bear wrongs patiently is a spiritual work of mercy. It is good to deny people the opportunity to do harm when we can, but if that can’t be prevented and we’re stuck with practicing endurance, instead, we’ll not go without our reward. It is Christlike to bear the harm that comes upon us without our choice by choosing to bear it as mercifully as the Father who sends His rains on the righteous and the unrighteous alike.
Trust your FIL can do you no harm that Your Father in Heaven cannot heal. Pray that the cup will pass you by, but if it comes, trust that you will be held up by grace.