> Being the best at one thing is very different from being good at everything, so it's unclear how that advice applies to your children.
My kid pushes too hard when he realizes he's plateau'd at some skill level and then gets disappointed at the steepness of the learning curve.
It'll go from chess to skiing, then it is swimming and now he's running a trail 10k in March. While he's able to say Good morning in everything from Esperanto to Klingon, by way of Welsh and Japanese, he's not gotten fluent at any language so far.
Not that any of that is bad in itself, but he goes into a maximum-effort "not fun" mode when he gets moderately good at anything.
The "not fun" mode kills the joy and then the activity becomes almost painful.
Mostly I try to help him stay in the happy zones with "A little is enough" instead of setting himself up for failure constantly like this, by failing his own expectations.
The younger one is obviously out to out-compete the older, so hopefully I only have to do this teaching once for both of them.