Relatives in the entertainment industry

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I was just watching Without a trace and remembered that when it started I wondered in Eric Close was related to Glenn Close which they are not. Then I got to wondering how many other actors may fall into that category, Adam Baldwin who was in Firefly is on Chuck is not related to the Baldwin brothers. There are several famous acting siblings and families, the Sheens : Martin, Charlie and Emilio Estevez are the most well known, the Coppola's with Francis Ford, Sofia and Nicolas Cage. The Houstons etc there are a great many families. So how many actors have similar names that are sometimes mistaken for family and how many actors come from an entertainment background. It would be fun to see how varied these actors could get.