Senior Miami roommates Dorothy Zbornak (Beatrice Arthur), Rose Nylund (Betty White) and Blanche Devereaux (Rue McClanahan) are in for a shock when Blanche's boyfriend of one week, Harry, proposes marriage to her. Meanwhile, Dorothy's mother Sophia Petrillo (Estelle Getty) moves in with the girls after her retirement home burns down.

Dorothy's daughter Kate comes to Miami for a visit, and announces she's getting married. Dorothy is overjoyed at the news until she learns that Kate wants her father, Dorothy's ex-husband Stanley, to be present at the ceremony.

Rose becomes nervous when her latest beau, Arnie, invites her to go on a cruise with him. The two will be sharing a stateroom, which would be the first time Rose has slept with a man since her husband Charlie's death several years prior. Meanwhile, Dorothy and Sophia face off in a gin rummy marathon.