Sister and husband clash

[Frustrated567]

I (F, 40) have been married (M, 41) for 10 years. Over the years, my husband has grown to dislike my sister immensely. She can stir the pot a little, be a little intense and sniggers over things that aren’t really funny, i.e. one of our children misbehaving.
She left her ex husband for another guy and their divorce was quite messy, and she exaggerated how her ex was unsafe and unstable towards her and the children, so he wasn’t allowed to see them much.
Despite all of this, she’s my sister and I see her regularly.
However, my husband is fiercely principled and will not spend any time with her. This is causing a lot of issues between us, and I feel really sad that he can’t just ‘get on with it’ and be in the same room as her a few times a year.
We have recently been invited to a wedding, and her and her partner will be there. My husband is refusing to go, and I feel really let down about it, and struggling to understand why he won’t come for my sake. I have to keep making excuses for him, and it’s left me questioning his love for me, and our marriage.
AIBU?

He avoids her. They are in the same family , and these events will regularly come up. The husband needs a better strategy than not going- all that does is make things harder for the OP

Mumsnet blows my mind.

Why do you need to make excuses? He can RSVP himself.

What would happen at any possible future family funerals? Would he not attened to support you if needed?

He is avoiding her, by not going to the wedding. If he goes, then if she wants to find him and make trouble, she can do so.

Your sister sounds horrible, the harm she has caused her children and ex isn't stirring the pot, it's abuse.

I'm not sure how you can willingly spend time with her.

This, she’s a twisted liar, but given op and her family know this, and don’t seem to care how these lies will mess her kids up, don’t think would want to spend time with any of them!