I do 'get' the son worship @Peterbear and many women have experienced it. Their brother (the son!) never doing a damn thing wrong, ever, and never doing shag-all to help the parents. He just take take takes, and never gives, but is worshipped. Whilst the daughter does loads for the parents, runs them about, does home admin, and household chores for them etc, and gets no thanks.
But your example is not very good, because as some posters have said, of COURSE your parents and aunts and uncles etc are going to be clamouring over him, if he lives abroad and only comes in the summer to visit for a few weeks. I'd be surprised if they didn't do that to be honest.
If he is generally worshipped then that is annoying but, as has been said, this is very common sadly. And it IS steeped in sexism. And the mothers are worse than the fathers for worshipping sons IMO and IME. And as I said, they can do no wrong, and it's like the sun shines out of their arse, even though they do nothing to deserve the adulation, except exist.