By Wilton Jackson The father and son shared a special moment on the field Saturday. The only thing better than watching Vladimir Guerrero Jr. blasting a home run out of Rogers Centre is a sighting of him and his father, Guerrero Sr., on the field at the same time. On Saturday, Guerrero Sr., wearing his Expos jersey, threw out the ceremonial first pitch to Vladdy Jr. But, the Blue Jays took the day a step furhter by honoring the two of them in a bobblehead giveaway before the start of Game 1 of the Blue Jays doubleheader against the Rays. When Vladdy Jr. received his bobblehead, he did not thin…