I feel for you. If I had booked to go back and my family had asked why, I would seriously throw my toys out of the pram!
It's not so much WHY, but WHY SO SOON?
Ummm... not that any of you would know, because you've never flown anywhere, but generally the best prices for tickets are obtained when you book WELL in advance.

I told them at 2018 THanksgiving that I would be coming for 2019 Thanksgiving, and that I'd be booking at new year. Niece got engaged at Christmas, so they've had 2 weeks to tell me to hold fire, but they didn't.
I just hope I can get the time off, once they set a date. I really would prefer to go for a wedding, over Thanksgiving. But holiday time in this office is tight, and only 2 people are allowed off at a time. If it's during any school holidays, I have ZERO chance.