Aunt or Uncle!
“Oh, boy! My sister is preggers! In nine months, she’s going to give birth to a baby boy or girl! I can’t wait to find out the gender of the baby, so I’ll know for certain whether I’m going to be an aunt or an uncle!” What?
Your status as an aunt or an uncle isn’t dependent on the gender of your nephew or niece. If you’re a dude, you’re going to be an uncle. If you’re a female, you’re going to become an aunt. It’s not rocket surgery, people. But you can switch up your status from aunt to uncle and vice versa if you so wish to choose.