Just some background.
He's 21
He's severely autistic.
He is musically gifted and has perfect pitch.
He is highly intelligent but cannot / will not use it.
He is at heart a wonderful, wonderful young man but suffers so badly. He is on antipsychotics and diazapam.
Over the years, starting from when he was 5 he wanted and got piano lessons, clarinet lessons, saxophone lessons, drum lessons. As soon as he can play them he loses interest.
Additionally he has asked for and been given - keyboard, sound studio to make digital music, ukulele, classical guitar, electric guitar, electronic steel tongue drum, some weird thing that makes sound effects, recorder and little things like tambourine, maracas and so on.
He is very quick to learn to play them.
They are all currently in my room. He brought them in the other day. He no longer wants them. They are not interesting. He wants drums.
He has also pulled this shit with - Nintendo Wii, Xbox. PlayStation. Nintendo switch. 3ds. Some retro game thing. It's grey and uses cartridges. The list is endless.
I've got boxes of different games and consoles in my room because he has one of his moods and chucks them all out of his room. I cannot sell them/ give them away because he would absolutely melt down.
He's now banging on (sorry. Couldn't resist) about drums.
I already know that he will use them for a couple of months max then throw them out of his room and pester for something else.
But if I don't get them he will go on and on and on and on until I lose the plot.
If I get the drum kit he will then want the next thing and it all starts again.
If I don't get the drum kit he will continue to obsess about it.
Yabu - get the drum kit. then the next thing. Then the thing after that. And the thing after that
Yanbu - don't get the drum kit make this your hill to die on. Pay for a weekly booze subscription service or start making bathtub gin.