Three! I've actually been waiting for the opportunity to elaborate...

Hawon is first, of course, and she presents as a female alpha! She takes after Kai the most (and her aunts Lea and Hiyyih hehe)

Haeun is second; she presents as an omega. She's about three years younger than Hawon, since yeonkai began trying to have another pup a year after Hawon was born, and it took about a year for Yeonjun to become pregnant. It took some time for Yeonjun to overcome his fear of pregnancy, and the birth was a bit harder on him, but he truly wanted it and all that mattered was that they were both healthy by the end of it

Hajun is third, and he was carried by Taehyun! He's also an omega, and Tyun demanded that he be named for Yeonjun <3 I think taejunkai would have been happy with their two daughters, but they were leaving their options open and decided they'd continue discussing their family size/see how they felt as the babies grew up. They didn't have much time before Taehyun's birth control failed yet again... and they decided to roll with it lmao. There's probably about a two year gap between him and Haeun. Kai's vasectomy was scheduled right after the birth because Taehyun decided he was all done hahahaha