Sisters Kate and Lauren lead vastly different lives. Lauren has three children and works as a midwife when she’s not off on maternity leave. Kate is a reporter who has been trying to get pregnant for four years. Every week they do Sunday lunch at their mom’s house. They are not close at all but try to give their mom some family time now that their father has passed. Until one day, a half sister shows up and causes them to question the man they thought they knew.