Mothering Sunday (2021)

On a warm spring day in 1924, house maid and foundling Jane Fairchild finds herself alone on Mother's Day. Her employers, Mr. and Mrs. Niven, are out and she has the rare chance to spend quality time with her secret lover. Paul is the boy from the manor house nearby, Jane's long-term love despite the fact that he's engaged to be married to another woman, a childhood friend and daughter of his parents' friends. But events that neither can foresee will change the course of Jane's life forever.

Source: TMDb