Mitt Romney's five sons -- Matt, Tagg, Craig, Ben and Josh -- are sitting pretty with a trust fund worth $100 million. To get to $100 million, the account would have needed a 26% average annual compound rate of return, said Jonathan Bergman, chief investment officer at Palisades Hudson Asset Management. Stocks over that same time have gained about 10%. Plus, there are probably many investments we don't know about. "Romney probably invested the trust in the same kinds of things he invested in himself, like startups and private equities -- investments with high growth," said Tim Gagnon, assistant academic...