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It's a family affair!

On Saturday, Naomi Watts rounded up all her boys as they embarked on an errand trip that included a stop at Home Depot and lunch at Swingers Diner.

The peaceful outing comes just a day after Liev helped break up a fight between a photographer and a waiter while at dinner with Naomi and Simon Baker at Giorgio Baldi in Santa Monica.

He's quite the peacemaker!