he's david lefkowitz, senior equity strategist at u.b.s. how do you teach your kids one of the biggest money and life lessons of all? alisa weinstein has some tips in tonight's kids and cash, she's author of "earn it learn it" and founder of "help kids fly". >> there are three little words children say that every parent should love to hear. we're talking heart-warming like nobodys business. those three words? it's not fair. it could be about pieces of candy or who gets to pick the book to read at bedtime, its not fair is the best. why? because life isn't fair. and the sooner kids learn that their happiness is not dependent on how much someone else has, the more fulfilled they'll be. especially when you're talking about money. the second my four-year-old realized i paid him less than his older sister, you got it. it's not fair. and i suspect, if you have more than one kid at home-and you're paying two different amounts- you've heard it, too. so, what to do? ask your younger child why aren't you earning as much? adult salaries take into accou