Ernestine is a minor fictional Muppet character, used occasionally in Sesame Street segments, who is Ernie's cousin.
Ernestine appeared with Big Bird and Gina Jefferson in The Best of Ernie and Bert, a video of top Ernie and Bert segments.
Ernestine has been often mistaken for Natasha, who is of no relation in the series. Ernestine appears in at least two Sesame Street episodes (in 1985 and 1989).