It could be that the parents are too strict and the kid wants some space and freedom. Or perhaps the kid has a surprise planned for the parents and doesn't want to spoil it.
The kid might be hiding because they got a bad grade and don't want to show it to the parents. Another possibility is that they are playing a game and this is part of it.
The reason could be that the kid got a bad grade at school and doesn't want his parents to know. Or maybe he saw something scary and is seeking comfort in hiding.
Maybe the kid is playing a hide-and-seek game and is just having fun.
The cartoon kid might be hiding under covers because they heard a strange noise and got scared. Maybe they just want to have their own little private space for a while.
Maybe the kid is scared of something or just wants to have some alone time and feel cozy.
Maybe the kid did something naughty or disobeyed the rules.
The cartoon kid might jump on the parents' bed or shout loudly to wake them up.
Maybe the parents are too angry and lose their tempers. They don't think about the impact on the kid or the teacher when they do that.
It could show parents patiently explaining something to the kid, maybe teaching them how to read or do simple math.
Maybe they think being a doctor offers stability and a good income for the kid's future.
Often, cartoon parents tell their kids by setting clear rules and consequences. Like saying 'If you don't clean your room, you can't watch TV.'