To encourage communication with narc bil [35m] or not

So my husband and bil haven’t talked in over 5 years.

The root of this problem stems from my sil who wanted my husband to marry one of her cousins. She would invite my husband to her paternal home where her cousin would be hanging out but nothing came of it because my husband and I were already serious. When she came to know that we were to be engaged she started talking ill of me to my husband’s family. She really wanted that for some reason. It basically boils down to a difference in education and family wealth between us. I have a masters and my family is reasonably well off. Whereas, only her father is educated (homeopathic doc) and she herself has completed class 12th. She isn’t well read or well travelled and outside of gossiping and tv has no interests. I don’t want to sound mean but she was raised in the part of Chandigarh where the domestic help reside. So for her it’s the first time she’s seeing some money.

Anyways, I’m completely unaware of what she said to my bil 5 who lives in Canada but he called my fil and said he won’t be attending the wedding if my husband marries me. To which my fil said that the wedding was going to place and if he didn’t want to come it was his choice.

It’s been 5 years now since my husband and his brother have spoken. I feel like encouraging reconciliation and I have in the past. But I’m beginning to doubt if i should because of what i hear about my bil, which mirrors my father who has narc traits. Example being generous to strangers but disrespectful and no connection or empathy for family. Not having the ability to talk through problems instead turning a cold shoulder, and basically having little remorse.

I’ve told my husband many times to just pick up the phone because life is short…

But my husband would be doing all the emotional labor. Whereas bil has complete lack of accountability, and once again create distance due to the ability to resolve conflict. Resulting in repeated cycles.

I don’t want to have any kind of relationship with them. They’re toxic to others and each other within their marriage (lies, putting each other down etc)

I’m beginning to think it’s better for them to remain away. Narcs don’t really change and perpetuate the same circumstances

Shall I not encourage communication?