My sister in law and I have very close birthdays (hers was last Wednesday and mine is today). Well she makes a VERY big deal out of her birthday, she hosts a big lavish party every year, invites 50+ people, etc. Since her birthday fell on a Wednesday she decided to have the party today since it’s a Saturday. Today happens to be my birthday but I didn’t make a big deal of it at all, I didn’t even tell anyone because I knew it was her birthday party, her special time. To me it’s just not a big deal, we are in our late 20s and I just feel like it’s not this big hoolah anymore. When I was a kid we didn’t celebrate birthdays either because my mom was a single mom and worked 50 hours a week, so we just didn’t have the time or money. Well I happened to tell a guest I was talking to that it was my birthday during casual conversation and the guest made a toast saying that it was my birthday as well so we have two birthdays to celebrate. My sister in law was LIVID. She pulled me aside into her bedroom and said I made it all about me, I’m a selfish narcissist, and that I took away her big day. She asked me and my husband to leave and we did. I got 50+ texts from her saying how awful I am, how she hopes my marriage to her brother fails, how distasteful it was for me to tell that guest it was my birthday, etc. I asked her to please not message me again. I just feel awful. Apparently my mother in law had to console her because she had a meltdown and was sobbing after we left. Was I wrong?