Spouse of the Prime Minister of Canada turn herself into a First Lady. Canada has had two prime ministers who were bachelors, William Lyon Mackenzie King and R.B. Bennett. Mackenzie Bowell, a widower whose wife, Harriet, died in 1884, was also not married during his term in office. Pierre Trudeau began his term as a bachelor, became the first Canadian prime minister to get married while in office and ended it as Canada's first divorced prime minister. Three other Canadian prime ministers—John A. Macdonald, Alexander Mackenzie, and John Diefenbaker—were widowers, who each married their second wives during their terms as prime minister. Macdonald's first wife was Isabella
Prime Minister of Sri Lanka As per the constitution, if the office of president becomes vacant, the prime minister would "act in the office of President during the period between the occurrence of such vacancy and the assumption of office by the new President and shall appoint one of the other Ministers of the Cabinet to act in the office of Prime Minister". In such as situation, the office of Prime Minister is vacant or the prime minister is unable to act, the Speaker shall act in the office of President. The president may appoint the prime minister to exercise, perform and discharge the powers,