Nellie Olesen was played by Alison Arngrim. I don't know what you mean by the original. Nellie was never replaced in the series. After she married Percival Dalton, they had twins they moved to New York to take over Percival's fathers company after he became sick. After the move, Nellie and Percival didn't come back into the series until the 9th season. Nellie's parents adopted a child named Nancy who acted just like Nellie.
Eric Olsen plays for the Tennessee Titans.
Dylan Olsen plays for the Florida Panthers.
Dylan Olsen plays defense for the Florida Panthers.
Greg Olsen plays Tight End for the Carolina Panthers.
Mary-Kate Olsen plays Kendra in Beastly.
The person who plays Vanessa is Olivia Olsen
Olivia Olsen plays Vanessa Doofenshmirtz
Nellie Oleson was yes, a real person and I am living proof. She is a distant relative back only by a few greats. She my a grandmother or aunt is what I mean but there are some greats in there.
Olivia Olsen
Olivia Olsen plays Vanessa Doofenshmirts
Sam Huntington plays Jimmy Olsen. He's recently been staring in the TV show "Being Human"
She plays Dee on its always sunny in philadelphia