I’ve got an MINIX Windows box and kodi runs with no issues – have it run at startup in full screen and there’s no real sign of it being a windows box.
It’s not actually any better than when I had it running on openelec on my Raspberry Pi though – apart from slightly easier for me to fix remotely when I’m not at home and something is up with it (used to happen on my Pi as well, but couldn’t be arsed to ssh into it as too much faff)
if they want to use it for stealing/streaming stuff they haven’t paid for then you’ll probably have a bit of troubleshooting regularly when the streams need updating etc as I’ve heard lots of people having issues even with those that supposedly auto update.
Learn a bit about Kodi and how it all works, and just set it up yourself – that way you can support it easier when it all goes tits up (and it will – as it’s in your parents house and it’s the law)