His Temporary Wife (1920)

Wealthy old Howard Eliot is so pleased with his young nurse Annabelle Rose that on his deathbed he bequeaths her an envelope with the caveat that it not be opened for sixty days. The remainder of his fortune is left to his son Arthur with the stipulation that he must marry anyone except his current girl friend, the fortune-hunting Verna Devore. In order to meet the requirements, Arthur places an advertisement for a temporary wife.