Is Joy-Anna Duggar the next Duggar kid to enter into a courtship? If she is, then her potential suitor is going to have to pass a stringent sibling check first because all of her brothers want nothing but the best for their 18-year-old sister.

"For me, he would almost have to be a perfect guy," Jedidiah, 17, told PEOPLE. "And he would go through a lot of testing!"

"I think if guys come around, they're going to have to get through a few guys – [I'm] talking about me and [my brother] Joseph," added Josiah, 19.

Joseph, 21, suspects that Joy-Anna's potential suitor might feel intimidated because they are all going to be watching his every move. "If a guy shows up to court Joy, there will definitely be a lot of us standing back a little bit, kind of checking him out," he said.

On the other hand, Joy-Anna's sisters have noticed how much she has changed from her tomboy days, and this is why a few young guys have "expressed some interest" to court her.

"I think it's really neat to see throughout the years [how] she's really changed and grown up a lot," Jinger, 22, said of Joy-Anna. "Years ago, she would have been the tomboy out in the trees and climbing all over the place, never wanting to fix her hair."

Joy-Anna said her brothers have made a great influence on her interests and personality, and this is why she is less a girly-girl and more of a guy's girl.

"I think being the only girl in the middle of eight brothers, I was definitely a tomboy back in the day, I was always hanging out with my brothers," she said. "But now I'm kind of getting out of that stage and trying to grow out of that."