Some family trees are lucky enough to have not only one celebrity, but several. Take a look at some famous celebrity siblings, including birthday girl Maggie Gyllenhaal and her brother Jake.
Peter Fonda, seen here with daughter Bridget Fonda, is well known for movies such as "Easy Rider" and "Ulee's Gold," both of which earned him Oscar nominations. His older sister surpassed him, winning two Oscars of her own.
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