Mary Therese is a fictional character portrayed by Mimi Lieber in the TV series Friends.
In the first episode they appeared in, titled The One Where Chandler Can't Remember Which Sister (season 3), they were 40 years old.
They appear in 1 episodes out of a total of 234 aired
Episodes1
The One Where Chandler Can't Remember Which Sister
episode S3.E11 january 1997A drunken Chandler fools around with one of Joey's sisters - but he can't remember which one. Ross becomes skeptical when a guy at the diner gets Rachel an interview for a position at Bloomingdales.