In laws have similar issue – one brother in law working hard, earning well; the other on second degree having decided that first one was not for him and cant be bothered to work holidays etc.
So on one hand a student they agreed to support, on the other working, earning son. Was/is it fair to 'penalise' hardwork with higher cost, vs other one not being able to complete his studies? If they did not charge, it would be too easy for both of them (22 and 24) to stay at home permanently…
And a need to pay off a mortgage asap and cover costs! Bear in mind costs of having at home can be high – the lads eat a mountain of food, leave computers on 24/7 and tumble dry everything etc etc.
They now pay £60 per week rent+food, plus a share of 'real' bills (ie each adult pays a 1/4 of gas and leccy and phone etc)