Both my son and daughter's tuition payments depended on rules I placed upon them prior to paying for any student debt. Housing, tuition, books, lab fees, etc. Simple rules such as, number one priority was to their academics period. This meant no relationshits and absolutely no "ops, we're pregy" announcements. Also they were required to maintain an above average gpa. There is also the job requirement, that means they have to maintain a part-time job. This isn't just to repay me, this is to build work ethic and actually have real skills after graduating and entering the work force. I get most of the money back from my daughters tuition because she works at a hospital that has a 100% tuition reimbursement program, she's studying to be a dental hygienist. My son however is not doing this and has chosen to borrow the money from me interest free until he gets a job post graduation. They have both signed legal contracts with me outlining their responsibilities.
Bottom line here is that I am treating them just like any other adult I enter into a business dealing with. It's a shit load of money and should be treated with the seriousness it deserves. Many college kids have absolutely no idea how the real world works because mommy and daddy coddled them throughout their schooling.