I want to give this to my brother for a wedding gift for a wedding that I don't even want to go to?

I won an AirPod Pro Max. It's sealed, in the box.. I don't think I'm going to get enough of the retail value for it, so in my mind this is like giving him a $500 gift. My mom thinks I can't give him that because he will assume I didn't actually pay for it and it has to be for both of them, but again, I don't care. My grandfather being upset if I don't is the ONLY reason I am going to this wedding. I don't like her, and I don't approve.. He knows that anyway, although we generally get along and don't discuss this.

I want to give this to my brother for a wedding gift for a wedding that I don't even want to go to?
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