If you get away with behaving badly at home then you're more likely to throw tantrums and misbehave at school, according to research by teachers.
Lots of teachers reckon if you play up to get what you want from your mum and dad and don't get told off, you're likely to try the same tricks in class.
As a result, teachers say more and more of their lessons are being disrupted.
Some parents who were asked said they gave their kids whatever they wanted just to get a bit of peace and quiet.
Now teachers want more advice available to parents who struggle to discipline their kids.