Should fiancés brother propose to his girlfriend during our engagement?

So my fiancé’s brother is proposing to his girlfriend tomorrow, and yes I am happy for them. But I feel like my thunder has been stolen because we got engaged about 9 months ago and are planning the wedding. Here’s the kicker, his family planned a vacation to the beach for the proposal and even invited close family friends, but not us. Also we were planning our wedding in the fall and that’s when they have been planning their wedding. (Yes, they were not even engaged but planning out their wedding) like I said, I’m happy for them but I feel that my wedding is going to be a second thought now. Especially since my fiancé’s brother is his half brother and my fiancé’s step mom (been around since he was 2) tends to favor his brother. Any advice as to how I could feel better about the situation, if we should push our wedding to be sooner, or let them have their glory and we can have our moment after?

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