Hi, does anyone else have this problem?

My oldest bd7 is copying sd17 attitude. Its disgusting. I've set up a chart where bd7 and bd6 get points for good behaviour and house work.
There reward will be a trip to the cinema.

Points aren't easy to win, they only got 21 in a week and I've never seen kids get ready for school so fast in my life all week do homework so fast or tidy there rooms so well. And attitudes have been reduced.