He forgets things I tell him how to deal with it?

He cannot focus on two things at the same time.. Whenever he plays video games or looks at his phone he imitates as he listens but in the end, he always forgets the things I say which makes me super mad and I cannot control my anger about it anymore.. I find it very irresponsible. How to deal with it?

He forgets things I tell him how to deal with it?
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