Kim Kardashian West and Kanye West are making co-parenting work amid their split. The two reunited on Saturday to take their four kids to a museum in San Francisco, a source tells ET.The estranged couple took their children -- North, 8, Saint, 5, Chicago, 3, and Psalm, 2 -- to see the Asian Art Museum before it opened to the public and were courteous to everyone on staff, our source shares.