If you have adult DC who are working adults now. Do you charge them board? If so, is it less or equal to market rate?
If they are working, do you care what they do with their money once they've paid their bit of the bills?
As in if you don't charge them board and they are going out out often and spending a lot, would it bother you because "they should be saving more"?
Or is it more of a once they've done their bit at home, paid their share of the bills, done their bit of keeping up the house, you just let them be.
If you don't charge them board and you see them going out a lot and spending their income freely, would that make you change your mind and then charge them board?