It Takes Two (1995)

Alysa, a little girl, is on holiday in her father's estate. Next to her house is the summer camp for orphans that her late mother built. There she meets Amanda, a girl she befriends. When her father announces his engagement to a not very nice woman, the girls hatch a plan to make him fall in love with Amanda's social worker. A cute and funny 90s comedy with adorable performances by twins Mary-Kate and Ashley Olsen. Lovely and hilarious.