The kids have been a bit emotionally unstable since their mom left. They have been told they are going to see her regularly, but it's hard for their little minds to understand the situation. When they can't take their frustration out on an adult, they take it out on each other.
https://i.imgur.com/rdc4LiW.png
https://i.imgur.com/mETyPBJ.png
https://i.imgur.com/9jZUPzu.png
But luckily, they are still best friends and help each other keep the mood up as well. These days are a roller coaster.