AITA for not inviting a houseguest who gave birth 2 months ago to my party?

My (30F) fiance (31M) and I are getting married in 2 weeks. My aunt and uncle are hosting the reception, and wanted a trial-run party to test out the equipment and follow the event. Since we are **already** in the neighborhood (where we won’t be until the wedding), we decided to have an engagement party. There’s not a whole lot to do in that area, so the party is really a chance for people to hang out. <br><br>We could not invite everyone to the wedding, and the party was a chance to see a few people we could not invite. Thus, we did not invite my entire family, but did invite my parents. The party was also mostly a chance for my fiance’s family and friends to hang out without the wedding pressure. <br><br>My brother has kids, and his wife, Callie (29F), recently had a baby 2 months ago. He and his family live out of state, but he’s in town visiting with his **three** kids. They are staying with my parents. <br><br>Brother and I are not close. He is not in the wedding party or invited to the wedding. We do **not** get along at all. I did still invite him to the party because I wanted to see my niece and nephews. <br><br>I did not invite Callie to the event. It was a casual thing without a lot of space for kids or a tired new mom. She also is not close to me at all and I didn’t really think she’d care. <br><br>My parents were mad about this. I told them it was not a good place or time for a new baby. Also, Callie was not close to me, and I didn’t invite a lot of people in my family, including a few aunts and uncles. They argued I am perpetuating a family feud by not inviting her. My brother is also upset. Callie just said she understood.