I didn’t go to uni but my brother did and had his rent paid for him and an allowance throughout the 4 years he took to complete his undergraduate degree. I was basically kicked out at 19 so my parents could move away and follow their dreams and I struggled, holding down three jobs to pay the rent and bills.
Thanks to my amazing DH’s encouragement and support I’m now, finally, able to be a very mature student!
My mum is helping us out by paying for DC1’s uni accommodation at the moment, as I can’t afford to fund it on my vastly reduced hours (there are f/t placements involved, so will have to quit paid work altogether soon).
DH’s income is just above the threshold, which means DC1 (technically his stepchild) and I receive minimal student loan. DC1’s bio father is very much in a position to help, but is so mean and has made any financial support so conditional and complicated that it hasn’t happened and is probably the final nail in the coffin of their tenuous relationship.
My mother can easily afford it and wants to help DC1 (and therefore us as a family) so this is her way of doing so without upsetting any applecarts. She’s never really given either of us any money especially just for no reason. Although I suspect she’s paid for holidays she’s gone on with DB and family which I don’t begrudge at all - he and SIL have taken one for the team.😉
So, in answer to your question OP, I would see how their lives pan out and see if there are other ways to help DC who don’t attend uni.