Ann Wilson is the older sister in the rock band Heart. Her younger sister, Nancy Wilson, joined her in the band. Multiple sources confirm this:
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Wikipedia: Nancy Wilson's Wikipedia page explicitly states that she rose to fame alongside her older sister Ann. (https://en.wikipedia.org/wiki/NancyWilson(rock_musician))
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Biographies: Biographies of both Ann and Nancy Wilson consistently describe Nancy as Ann's younger sister. (https://www.biography.com/musician/ann-wilson, https://en.wikipedia.org/wiki/Ann_Wilson)
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Articles: News articles and features about the band Heart repeatedly refer to Ann as the older sister. (https://www.rollingstone.com/music/music-features/heart-can-ann-and-nancy-wilson-go-on-after-family-assault-115109/)
This information is consistently presented across multiple reliable sources. Nancy Wilson is four years younger than Ann.
