MacMillan was the mother of Stefan Arngrim (born December 23, 1955), who played Barry Lockridge on Land of the Giants, and Alison Arngrim (born January 18, 1962), who played Nellie Oleson on Little House on the Prairie.
He is perhaps best known for his role as Barry Lockridge on the Irwin Allen television series Land of the Giants which aired from 1968 to 1970.
Stefan Edberg | Stefan Sagmeister | Stefan Lazarević | Stefan Zweig | Stefan Raab | Stefan Heym | Ştefan Voitec | Stefan Dennis | Stefan Żeromski | Stefan Wyszyński | Stefan Nemanja | Stefan Karlsson | Stefan Brockhoff | Stefan Aust | Alison Arngrim | Adam Stefan Sapieha | Stefan Weisman | Ştefan Vodă | Stefan Skarbek | Stefan Simonsson | Stefan Olsson | Stefan Lorant | Stefan Lochner | Stefan Heidemann | Stefan Guzy | Stefan Gryff | Stefan Grossman | Stefan Everts | Stefan Danailov | Tadeusz Stefan Zieliński |