The third installment of the comedy hit reunites us with the family as they gather at a quiet rural retreat for a christening. Wanda and Tadeusz organize the ceremony, inviting Małgorzata and her friend, psychotherapist Grażyna. Małgorzata's ex-husband, Andrzej, also attends, flying in from Australia—and this time, he's not alone. The atmosphere quickly spirals out of control, as old conflicts and new romances lead to unexpected consequences—this time involving the local police! "In-Laws 3" is a film that shows how even christenings can turn into a family battleground, and betrayal isn't as divisive as... the Holy Sacrament!