United Kingdom, Feb. 13 -- Ariana Grande's brother Frankie gets "very emotional" when he thinks of his younger sister's success.

The 31-year-old pop singer has been nominated for an Academy Award for her role as Glinda the Good Witch in 'Wicked' and her older sibling, 42, has admitted that he will always be there to "support" her throughout everything.

He told UsWeekly: "It's very emotional for us as a family, and so we're just there to support her, whatever she needs. If she wants to showboat, party, whatever [she] wants, but no one's making plans. We're just all very, like, [playing] it by ear. I just so unbelievably proud of my little sister being nominated for an Oscar. I'm going to cry on this red carpet!"

Frankie - who is known f...