<P> The following are fictional characters in the American animated television series South Park . </P> <P> Randy and Sharon Marsh are the most prominent set of parents on the show . Their first names are derived from the first names of series co-creator Trey Parker's parents . and Parker describes Randy as "the biggest dingbat in the entire show ." Randy is voiced by Parker . Sharon was originally voiced by Mary Kay Bergman, later Eliza Schneider, and is currently voiced by April Stewart . </P> <P> Shelly Lynn Marsh is Randy and Sharon's daughter and Stan's older sister . The character was voiced by Mary Kay Bergman until Bergman's death, and Shelly has subsequently been voiced by Eliza Schneider . Her new voice artist is April Stewart . </P> <P> Shelly has an extremely aggressive temper and has very little respect for Stan and his friends, usually referring to them as "turds". In "An Elephant Makes Love to a Pig", she physically abused him, hurled him around their house, and in the feature film South Park: Bigger, Longer, Uncut, she demolished a wooden chair over his head . This does not mean she hates her brother, as in the former episode she lies to protect him from being sent away . There have been other moments when she also seems to have superhuman strength, and once had the ability to lift a piano over her head with ease, seen during "Mr. Hankey's Christmas Classics". She does help Stan when he is in real danger, although in "Pre-School" this was apparently only because she wants the privilege of beating up her brother all to herself . </P>

What is stan's sister's name in south park
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