Ida is a 40-year-old architect, single and starting to panic. She's navigating Tinder and contemplating freezing her eggs, but forces these worries to the back of her mind as she sets off to the family cabin for her mother's 65th birthday. But family ties old and new begin to wear thin out in the idyllic Norwegian countryside. Ida is fighting with her sister Marthe, flirting with Marhte's husband and winning the favour of Marthe's stepdaughter. Some supposedly wonderful news from her sister sets tensions simmering even further - building to an almighty clash between Ida and her sister, her mother, her whole family. Exhilarating, funny and unexpectedly devastating, 'Grown Ups' asks what kind of adult you are without a family of your own.