The Parent Trap originally starred which younger sister of Juliet Mills?
The Parent Trap (film series): The Parent Trap is a film series, originating in 1961 with Hayley Mills as the twins. Hayley Mills: Hayley Catherine Rose Vivien Mills (born 18 April 1946) is an English actress. Hayley Mills:  The daughter of Sir John Mills and Mary Hayley Bell, and younger sister of actress Juliet Mills, Mills began her acting career as a child and was hailed as a promising newcomer, winning the BAFTA Award for Most Promising Newcomer for her performance in the British crime drama film "Tiger Bay" (1959), the Academy Juvenile Award for Disney's "Pollyanna" (1960) and Golden Globe Award for New Star of the Year – Actress in 1961.
Hayley Catherine Rose Vivien Mills