When Pete and Ellie decide to start a family, they stumble into the world of foster care adoption. They hope to take in one small child but when they meet three siblings, including a rebellious 15 year old girl, they find themselves speeding from zero to three kids overnight. A couple decides to start a family by adopting three children through foster care. But chaos strikes as they stumble through caring for a traumatised teenager and her two young siblings. Instant Family is a 2018 American family comedy-drama film starring Mark Wahlberg and Rose Byrne as parents who adopt three siblings.