no, that's their omega daughter and Aeroc is pregnant with their third child.
Aeroc still want 6 children he will has miscarriages too still trying since Omega's body can't handle this many births, first-timlime aeroc was alpha mixed with omega but his body was strong that's why it was possible for him to have so many children and miscarriages in slum still stay alive that's why aeroc didn't stop and kloff knows he will die one and he will die with aeroc tooo cuz he has bonded with him that's why he told his eldest son to take care of his siblings and that changed their first child prospects that "i will never bond with anyone".
You clearly didn't read the novel.
Is this supposed to be a reply from me comment? I'm talking about the last chapter. The last scene to be specific.
Wait! Is there a novel??? O.O please share it's English translation link. T.T and yes I've only read the manhwa and at the end it clearly looked like what I've written in my previous comment.
I wouldn't be confused and accused the artist of mistaking rapiel's child being aeroc's daughter in the last scene if Im only reading the manhwa lol. Anyways here's the link https://novellive.com/book/into-the-rose-garden
As far as i remember they only had 2 kids. It's lennoc and an omega daughter idk the name. The one that lennoc is playing with on that last scene is rapiel's child because aeroc is still pregnant with theire second daughter. I think the artist confused them.