Ghostbusters: Afterlife star Mckenna Grace is set to star in a limited true-crime series based on the Jan Broberg kidnapping case for Peacock. It was announced today that Grace will star in ‘A Friend Of The Family’. Based on the Broberg family, whose daughter Jan was kidnapped multiple times over a period of years by a charismatic, obsessed family “friend.” Grace will play Jan Broberg in the later years.