Short summary at the end. Sorry, this is long, and I know a lot of people won't read it, but if you can, I would love to know if I'm overreacting, or simply standing my ground because someone drew a line that they shouldn't have crossed.

My wife, sister and brother in-law all wanted to go see the Foo Fighters, which coincidentally isn't going to happy because the drummer passed away recently. There was a pre-sale and I happened to have access to it So, the night before they went on sale, I had explained to the sister in law, that It's much easier to find a pair of seats close as opposed to four together. She said she understood. Anyways, I found the first pair and got them. I continued trying again, over and over, until I landed another pair, one section over, nearly identical rows. I advised that a pair of tickets were roughly $190 each, but toss in the wonderful Live Nation ridiculous fees for no reason, it was going to be about $550. I waited a couple of minutes, with no response. So I texted again explaining that there were only a couple of minutes left, or we are going to lose these seats. She wrote back with about 3 minutes left and told me she didn't realize how much the tickets were going to cost, and that she would have to talk with her husband later when she gets off work. I explained once again these seats will definitely be gone, and the show will sell out. During all of these texts going back and forth, including before the conversation ended, I explained multiple times that I was buying these tickets for my wife (her sister) for her birthday and requested for her to please not say anything. It was going to be a surprise, because she said she really really wanted to go, but she knew it would sell out and it would cost a crazy amount of tickets. Which, she was right. Prices soared and it sold out very quickly.

This all took place on a Tuesday, about two weeks before the big surprise birthday present. Well, on Friday night around 11pm, we got a phone call, which, when you get a call from family at that time of night, it's usually odd. She answered it on speakerphone, in case it was something important. I'm going to paraphrase here, because I can't remember off the top of my head the exact words. But her sister immediately started screaming at my wife saying things like "I hope you have a good fucking time at the Foo Fighters concert". "You're going to get to go, but because of your fucking husband who is an asshole, I won't be able to go. She then proceeded to rant on about how I had promised to get her tickets, and I'm worthless...you know...a few more choice words about me, that the show is now sold out, and they won't be able to go anymore, etc. She accused me of lying and purposefully not buying her tickets. She then said things like...we never liked him anyways, and even her husband doesn't want to be around him (me). Which, this was actually a shock to me, because I thought we had a great relationship, but whatever. My poor wife is dumbfounded with an odd look on her face. She had no fucking clue what the hell was happening.

So, there went the surprise. Sister hung up the phone, at which point, my wife looked at me and said "I guess...thank you for the surprise tickets". Now, I'm standing there, just having been berated by this person, who not only accused me of lying, but also expressed her personal opinion about me, which is fine, we are all entitled to have our opinions on things. Here I am, I'm fuming mad because I specifically asked her to keep this a surprise. I'm also being accused of shit that did not happen. Then...here come the texts from her. More berating me and hearing things like "you promised me", and "I told you to get the tickets and I would pay you back". So, I proceeded to (once calm), screenshot the entire conversation via text. The last one being about how she didn't realize how much they were going to cost, and she would have to ask her husband first. I wrote a nice letter associated with the screenshots, thanking them for sharing their opinions, etc. Explained my point of view, and also pointed out that all of this was her fault, and thanks her for ruining the surprise present for her sister. Those tickets were freaking expensive. I didn't have a ton of gifts to give her, because her bday is on Xmas. Her last text to me was...I think I'm going to need to take some time away from you....you (me) are causing her too much to deal with.

Now, they are coming over here for lunch/dinner on Sunday. This woman came over a few weeks ago and brought her son (cousin to the twins) to play and have a small bday party for him. She actually asked my wife..."where is John". My wife explained that I was upstairs, because he was still upset with her little episode. She had the balls to say....well, he should move on from that...it was months ago. I would have expected maybe an apology...something like, coming upstairs and saying hey can we talk....nothing. Now I have two people coming over that have expressed their hatred towards me to spend the day breaking bread with us. Tough spot to be in, huh? I don't want to upset my wife, because it's her family, and it's Easter. So, it's not like I'm going to cause problems and try to ruin it for her and my kids. But, I certainly don't plan on "mingling" and hanging around these people. I guess I'm going to bring a cooler of whatever, Gatorade and maybe some white wine (I don't know why, but I prefer it, especially Savingnon Blanc and Voigner), and hang out upstairs in my man cave.

Thoughts?

TL:DR - Sister in-law talked a lot of shit about me, accused me of lying, expressed her hatred for me, and also mentioned her husband has never liked me. Wife invited her family over for Easter dinner. I want nothing to do with her sister, or my brother-in-law. I don't want my wife to be upset, so I'm not causing issues about her wanting to host this dinner. But, I want zero part of it. I plan to chill in the man cave the whole time.