<human>: Give me the gist of the text in a nutshell

So I got engaged on Friday and everything went swimmingly. Yay! And then shit hit the fan.

So my SO has parents that live in Malaysia. We live in the Southern US, so lots of travel time and jetlag. They have two young daughters ages 8 and 11 that are in school like all good children.  So when we were planning our wedding date we wanted to include them obviously and would have to either choose this summer, this christmas break or next summer.  (Their Christmas goes from early December to about Jan. 10th.)  Well we decided that we have enough time and we chose July because wanted to get it out of the way (Benefits, taxes, tired of waiting, etc.) 

Well here's the problem, Reddit.  My brother is getting married on this fall, and has asked me to be his best man.  He lives about 250 miles away and he and his fiancee only have family in our state.  His fiancee learns that we may have our wedding in July and loses it.  She proceeds to have a fit and spread talk to our other sister in law about it.  In my brother's words it will be a "shitstorm,"  even though he said that him and my other brother don't think it's that big of a deal. I should add here that the wedding would be on July 21st with his being on October 14th.

The kicker is the fact that he told me his fiancee wanted to not make me the best man and also they would not come to our wedding. 

So reddit, am I being the selfish asshole here, or is my brother?
<bot>: Had to plan our wedding around someone who lives 12,000 miles away and brother/fiancee is not happy about us having our wedding 3 months before theirs.