The Globe and Mail reports in its Friday edition that in a boardroom shakeup at Bombardier in February, Pierre Beaudoin stepped down as chief executive officer, and his father, Laurent, retired as chairman. The Globe's John Daly writes although there have been some spectacular crack-ups among Canada's richest families, a 2012 University of Toronto study of 23 large family-controlled public companies found that many outperformed the S&P/TSX composite index. What separates dynasties from debacles remains a study for academics. At Quebecor, Pierre Karl Peladeau took the reins after his father died of a heart attack. Often impulsive, he bought the Sun newspaper chain and Videotron, but oversaw the bankruptcy of Quebecor World, the printing business, in 2008. He plunged into provincial politics in 2014, and is now the shaky front-runner for the Parti Quebecois leadership. At Power Corp., Paul Desmarais Sr. sent his sons to good schools, mentored them on the job for years and then stepped aside to concentrate on the big picture. This, says Mr. Daley, is how you build a family business.