You do need to consult an attorney to make these specific bequests. But I would suggest that each family immediately open a 529 account, so you can specify name and account number for each in your bequest. The parent or parents would be “custodians” of these 529 accounts. If you’re in Illinois, have them go to www.BrightStart.com to open the accounts. They don’t have to start with a lot of money, and they will get a deduction on their state income taxes if they are Illinois residents.
Then the accounts will be ready and waiting when the time comes. And I hope it is a long time from now!
PS Even though the accounts are in the Illinois plan, the money can be used for college expenses at any school, any state.