then it might be better for you to apply for a settlement visa for her and her kids soon as your married.
maybe he can go and do a couple of A levels here ?? not sure the cost of that thou..
once your wife has been in the uk 2yrs apply for ILR, and i think he has to be in the uk 3yrs to get home fees.
so if he comes here at 16, does A level for 2yrs, takes a year gap, he should be able to pay home uni fees and do a degree here.
i suppose it all comes to home much money you have to pay for fees !
not much point in him doing a 5yr degree if hes going to have to drop out !