To not give DS his Christmas present because his behaviour is so bad?

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DS is 12 and in the middle of a really awful behaviour spell. We seem stuck between toddler tantrums and rages, he is rude and he picks on DD (5) all the time. His behaviour is really bad at the moment and anything results in whining or shouting and he is making the whole house unbearable.

He needs a laptop and asked for one for Christmas. I have it upstairs but I just dont feel like handing over a £250 present that he doesn't deserve. I have warned him if his behaviour doesn't improve then he wont have a laptop to open in less than three weeks. But I worry the whole day will be ruined, especially as he will whine to MIL/SMIL who feel like he can do no wrong, and so me and DH will be the bad guys.

Will it get better when he is 18?

Thanks everyone for your thoughts.

I agree with the idea of giving it to him and restricting its access. TBF he doesn't use a computer for much, but he does like to play minecraft. We have a cronky old computer which is too slow and DH's work laptop which he isn't allowed to use. He would use it down here as there isn't any space in his room.