Thanks to generous relatives my DC have healthy bank balances. We've never spent any of it but they are now wanting to do after-school activities than we can't afford & I'm considering using their money to fund it assuming of course they agree. Likewise, we think ds1 would benefit from some extra tutoring but haven't pursued it for cost reasons - AIBU to fund these things with their money?
To avoid later drip-feeding I should add that they each have a trust fund set up by my parents which should be enough for uni, first car or towards a house deposit so they do have some provision for later in life.