Genius (1999 TV Movie)
Charlie Boyle aka Chaz Anthony: I have to watch my sister.
Claire Addison: I thought you were an only child?
Charlie Boyle aka Chaz Anthony: I am. Sister... Mary Catherine... she's a nun... and an invalid.
Dr. Krickstein: Well, you can't be in two places at once. Violates all fundimental laws of physics...