Hi Lesh,
The Tyros 5 is a great instrument .. so long as you can find your way around it and get it to play the way you want to hear it.
How old are your grandchildren? Maybe keyboard lessons time on Mondays and Tuesdays? When I try to interest my granddaughters in organ/keyboard music I get this:
Thank you for asking Grandad, but I have a hockey match .. and it's not really my thing. But thank you.
The granddaughters are aged 14 and 16 so fair enough, they have other things to do in their lives and must know by now what they like and what they don't like. You could say the same about me. I have got to an age where I know what I like and what I don't like .. and I know what I don't like!
Hugh