Responses
Yeah he's acting like someone who got the attention of his fave person got divided because of an addition to the family
It makes sense, cuz sometimes the older brother get jealous of the younger ones xD
The ml doesn't actually hate the kid, he's just jealous? The last panels from last chapter are giving this vibe at least, I hope it's true cuz it would be adorable asf if they got together like a family （/TДT)/