Family troubles

Hello, after some advice. Me and my partner were getting married in November, My brother was meant to be a groomsmen and his W2B a bridesmaid, however, me and partner decided that we just wanted a small intimate ceremony so apologised to all of the wedding party and still explained we would still love them to join us, this was end of July 2021. We've then, brought it forward, due to close family members health, as we wanted them with us, which isn't guaranteed for November. Since apologising to the wedding party, my brother and partner have ignored me and my H2B messages. He's seen and read messages from us but doesn't reply. He'll call and send our parents messages, and he's invited everyone other than me and my partner to their engagement party. I'm a little upset they haven't replied to us and hurt that we haven't been invited to their party. I'm so confused 😕 we get married in July and I've asked for RSVPs back before May which I still think is a little later than average?
My partner hasn't invited certain family members he'd like there for my brother and partner to come. I don't know how to approach the situation. Xxx