It was mentioned in The Big Bang Theory (2007) that Mary, played by Zoe Perry, has 2 brothers: Edward & Carl. In this episode Mary (Zoe Perry) names a sister, Charlene.
In The Big Bang Theory (2007) Jim Parsons has claimed his parents had a dysfunctional marriage and no intimacy between them, however in this episode we see Mary (Zoe Perry) & George Sr. (Lance Barber) in bed together, intimately.
When George is getting Sheldon into the car in the rain a hotel guest on the top floor can be seen watching then going back in his room and closing the door.
This episode aired in Canada in December 2017.