Parent Trap III Mary Grand (Bridgette Andersen). Susan was married to Brian Carey (Alex Harvey). They divorced prior to the events of "Parent Trap III", and Susan reverted to using her maiden name, Evers. Hayley Mills returned in 1986 to the Disney Channel when she filmed "The Parent Trap II". She expressed no interest in returning for more sequels. In 1989, Mollie Miller soon began production on the next sequel, "Parent Trap III". Mills returned after her Disney series, "Good Morning, Miss Bliss" had ended. Barry Bostwick was cast as Jeffrey Wyatt and Patricia Richardson as his jealous, snobbish girlfriend, Cassie McGuire. Richardson
The Parent Trap (1961 film) ordered the script reconfigured to include more of the special effect. Disney also wanted Mills to appear on camera as much as possible, knowing that she was having growth spurts during filming. The film was shot mostly at various locales in California. The summer camp scenes were filmed at Bluff Lake Camp (then owned by the Pasadena YMCA, now by Habonim Dror's Camp Gilboa) and the family camping scenes later in the movie at Cedar Lake Camp, both in the San Bernardino Mountains near the city of Big Bear Lake in Southern California. The Monterey scenes were filmed in various