Let's Go To The Movies

Hallie Parker and Annie James (played by Lindsey Lohan) are identical twins separated at a young age because of their parents' divorce. Unknowingly to their parents, the girls are sent to the same summer camp where they meet, discover the truth about themselves, and then plot with each other to switch places. Hallie meets her mother, and Annie meets her father for the first time in years. they then make a plan to set up their parents, which suddenly goes awry with an announcement from their father. the story goes through many different twists and turns, and is an amazing story from start to finish.
Taken from IMDB

1. Parent Trap (1961)
2. Parent Trap II (1986) (TV)
3. Parent Trap III (1989) (TV)
4. Parent Trap: Hawaiian Honeymoon (1989) (TV)
aka "Parent Trap IV: Hawaiian Honeymoon"
aka "The Parent Trap IV" - USA (working title)