"Shark Tank" investor Kevin O'Leary said he gives his children the same advice he tells his social media followers: "Don't buy crap you don't need." Kevin O'Leary has been vocal about saving money for years. Related: 'Can Make a Ton of Money': Kevin O'Leary Says This Is the Most Overlooked Startup Opportunity Right Now"What's the first piece of advice I gave my kids about money, and the last piece of advice, and the advice I always give them? pic.twitter.com/mRjrOn9tWG — Kevin O'Leary aka Mr. Related: Here's How to Get an Investment for Your Business, According to 'Sharks' Kevin O'Leary, Barbara Corcoran, and Daniel Lubetzky