Heather Priestley and her ex-husband, Dane McAllister, get along as best they can for their girls, but they both have moved on with their lives. Heather and her new husband, Randall Hammons, have #twins and Dane has his new wife, Erin, a fellow #SerialRomantic. Will the exs keep getting along? Will a marriage between two people who don't like commitment work? Can Heather's four girls keep the peace in their complicated #MixedFamily?