TORONTO — An Ontario business magnate is suing his daughter, two grandchildren and others for allegedly mismanaging the family's assets and trust funds. Frank Stronach, the man who started the autoparts business Magna International, and his wife, Elfriede, have launched the lawsuit in Ontario Superior Court and said they have done so as a last resort. Stronach said in a statement Wednesday that the couple has made "considerable efforts" over the last two years to resolve the matter.