My brother's business is successful and now he's very arrogant?

My younger brother has started a business that has become successful and he's making heaps of money. I'm happy for him but he's become incredibly arrogant. He talks very loudly and constantly interrupts me when I'm talking, even after I tell him I'm not finished talking. My mother and cousins hang around him like they're attached to a string. He makes a big show of saying how he can afford to take care of her and be with the family. I am working a regular job and don't make as much to be able to take frequent vacations and family visits. I'm happy for his success but does he have to be so arrogant? How do I deal with it?
 
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