“Little House on the Prairie” 'was therapy' for Michael Landon, costar Alison Arngrim says

“Little House on the Prairie” 'was therapy' for Michael Landon, costar Alison Arngrim says

Arngrim played bratty Nellie Oleson, while Landon starred as the heroic Charles Ingalls on the ’70s TV series.Michael Landon stars on 'Little House on the Prairie' in 1977Credit: NBCU Photo Bank/GettyKey PointsLittle House on the Prairie star Alison Arngrim says costar Michael Landon treated their hit show like therapy.In addition to his role as patriarch Charles Ingalls, Landon was a director, writer, and producer on the show.More than 50 years…