You should keep a copy of your tax return indefinitely, but you need to save supporting documents for only three years.
Yes, your kids should go to school. No, you shouldn't bankroll their degree whatever the cost. You've spent your life creating a sound financial plan; don't upend it by suspending your retirement savings or taking out a home equity line of credit to pay for a pricey college.
Money you know you need or want to spend in the next few years is savings. Money you keep handy for an emergency belongs in savings. Money you hope to use soon for a down payment on a house belongs in savings. And all savings belong in a low-risk bank savings account or money market account.
I want to be clear here: It does not matter what you say in your will or trust; the beneficiary document attached to your IRA accounts and your life insurance policy overrides what you say elsewhere. If you want to change the beneficiary, you must change the beneficiary document.