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  THE TOMORROW WAR Director Chris McKay (at right) on the set of The Tomorrow War.   PHOTO BY AMAZON PRIME      Director Chris McKay is talking about chemistry in his new big-budget science-fiction movie  The Tomorrow War . But it’s not the chemistry of romantic leads. It’s family chemistry.      “It’s the number one priority,” he says. “You can get certain things wrong along the way. The visual effects could maybe suffer or something else could suffer, but if you don’t get the chemistry between this family right, then the movie doesn’t work. The rest of it is spectacle.”