Jumping back into the longform business in a major way, Walt Disney TV has entered into an agreement with ABC to supply the network with up to five family-oriented TV movies during the next two seasons.The first project in development is “A Family Promise,” written by Anna Sandor, whose credits include the recent Hallmark Hall of Fame-Lorimar TV production “Miss Rose White.” Janet Faust Krusi, of Kushner-Locke Co., will exec produce. In addition, Marian Rees Associates–well-known for its involvement in prestige projects, including “Rose White” and other Hallmark telefilms–will produce a second movie for ABC under the Disney banner. ABC scored a major ratings coup over the weekend with Lorimar’s “To Grandmother’s House We Go” (see ratings story, this page), which aired from 7-9 p.m. Sunday, the old slot for “The Disney Sunday Movie” when it aired on ABC in 1986. That Disney movie/anthology franchise bounced around the networks before it disappeared in 1990 after three years on NBC in one-hour form. Since that time the studio has focused on half-hour comedy series but says now it wants to be a leader in longform television as well.