This is a poor attitude to begin with, you shouldn't berate a child because they don't live up to your standards, he needs to be taught. Teaching takes TIME. He's not going to get this stuff overnight, in fact it will probably take YEARS of gentle reminding. If you can't handle that then I suggest you postpone the blending of households until you learn to let go of some stuff otherwise no one in the house will be happy.
Also you have to get his dad on board with what you're trying to teach (apparently to both of them). If he's not supportive you won't win this battle.

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