We do not have a stash to speak of at this time. My grandfather, however, plans to leave behind a multi-million dollar fortune (more Millionaire Next Door than Mustachian). My understanding is that it will be divided amongst the children with the understanding that it should be used to fund college educations indefinitely. It paid for mine. It is already paying for my kids'. (All the great-grands get $2K a year in their 529s.)
He used to say that he would pay only for undergraduate education. But the money kept growing, and the grandchildren grew up, procreated, were broke, and wanted graduate degrees, and he stepped in. (I paid a couple semesters of mine myself, got some scholarships, he picked up a few.) My sister, a nurse, is the sole breadwinner for a family of five--no way can she fund her own doctoral degree, so he's picking up the tab.
Although I'm pretty sure my mom plans to enjoy SOME of it... Earlier this year she bought herself a brand-new, fully-loaded 2015 Sorrento with a seven-year no-interest loan. And she's retiring after this year. Sounds like someone knows her father isn't going to live forever... (I have to admit, it's a SWEET ride.)