In this hilariously raunchy comedy, dysfunctional American siblings Alice (Kristen Bell) and Paul (Ben Platt) along with their ever-optimistic mom (Allison Janney), are invited to the British wedding of their estranged half-sister Eloise (Cynthia Addai-Robinson) as a chance for them to reconnect as – more or less – adults, and learn to love each other like they once did