Noo. I Think his the one that likes her the most. He craves for her attention and try to get it by the only way he knows: being a brat and having all the attention. His behavior is the by product of his mother upbringing, and I hope that this love doesn't become hate in the future. ( the way it's going he will become a man child in older age )
All the children in this story really deserves to bond together and fight the situation that the adults want them to be. Forging a path of happiness.
Every day I pray (to any God, really) that the author doesn't change the way the story is going, it's fresh and novel.
I like how mc's siblings genuinely care and love her.
.........maybe except her full-blood little brother....maybe?