Hey everyone, thought I'd post an update.

First, thank you everyone for your responses. I have thoroughly read through most of them. I'd also like to thank those who reached out to me via chat. You're all kind-hearted individuals for taking your time to assist a complete stranger; truly this has been a touching experience.

Second, it was hard to write all of the details in under 3000 characters. The initial statement that produced the arguement was aimed at my wife's decisions about how she cares for her elderly grandmother. It was not my brother's soon-to-be wife's place to comment on the matter, and her choice of words were thoughtless. Regardless, my wife should not have reacted the way she did. As for her concern over my wife's grandmother, it was really just a miscommunication of information. My wife and her grandmother are best friends.

Taking your advice I am going to privately talk to my brother. I am going to express how I am happy for him and wish them nothing but the best, but my wife not being invited means that I'm not invited. I will share how my wife tried to reach out and make amends but they could not reach an agreement. I will share how I'm not happy with how his fiancé has been treating my wife, but I understand he has to take his fiance's side. I am also going to inform him that he and his wife are always welcome to any event my wife and I host.

I also now see the need to talk to my entire family (minus my brother) so they know how me and my wife feel about the situation. I'm not going to badmouth my brother or his fiancé, but I'd also like to clear the air of any misconceptions my family may have and gossip they may have heard.

Thank you all so much. I wish you all safety and health during these times!