In France we have a very controversial provision of the Civil Code whereby parents have the obligation to support their children financially especially with university studies and it can go as far as court procedures but the judge who grants an allowance to the child will also demand that the beneficiary submits him/her all justifications for expenses (college enrollment, rental of a room in a students' home, and of course proof of regular attendance at classes and good results at exams). This may sound harsh but I believe applying this type of rule to the sustento may discourage idleness....
By the way the reason why this law is controversial is because lots of families have been shattered by conflictual and destructive situations deriving from the application of this law so obviously it has to be resorted to carefully and with some diplomacy....
