"I would downsize or mortgage my house before I'd send my children into the world as debt slaves." Absolutely. I wish there was a tactful way to tell my parent

"I would downsize or mortgage my house before I'd send my children into the world as debt slaves." Absolutely. I wish there was a tactful way to tell my parents this but its largely useless after the fact. My parents bought a huge McMansion "for the kids" with all the upper middle class trimmings and neglected to save a single dime for college. And so all four of their children will be paying off student loans for a decade or more.