In My Mother's Wedding, Captain Katherine Frost of the Royal Navy is about to embark on a new command when she finds herself reflecting on her childhood and her late father, John Frost, a Navy pilot. As she reads emails, her younger sister, Victoria, a famous actress, gives a live interview on a glitzy talk show where she publicly discusses her family's tragic past, primarily the loss of her father during the Falklands War and her mother's subsequent marriage to his best friend, Johnny Monson, who later went missing in action.

The three sisters reunite at their childhood home in Hampshire ahead of their mother Diana's third wedding to the amusingly named Geoff Loveglove . Tensions arise as they navigate personal issues, including Victoria's romantic pursuits, Georgina's concerns about her husband's fidelity, and Katherine's unresolved feelings for her partner, Jack.

As the wedding day unfolds, long-buried family secrets are revealed, causing rifts between the sisters. Amidst the chaos, Katherine receives unexpected news from Jack, which challenges her plans and priorities.

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