Which actor is Shirley MacLaine's brother?

Warren Beatty (né Beaty; born March 30, 1937) is an American actor and filmmaker whose career spans over six decades. He has been nominated for 15 Academy Awards, including four for Best Actor, four for Best Picture, two for Best Director, three for Original Screenplay, and one for Adapted Screenplay – winning Best Director for "Reds" (1981). Beatty is one of only two people (Orson Welles being the other) to have been nominated for acting in, directing, writing, and producing the same film, and he did so twice: first for "Heaven Can Wait" (with Buck Henry as co-director), and again with "Reds".

Henry Warren Beaty was born in Richmond, Virginia. His mother, Kathlyn Corinne (née MacLean), was a teacher from Nova Scotia. His father, Ira Owens Beaty, had studied for a PhD in educational psychology and worked as a teacher and school administrator, in addition to dealing in real estate. Beatty's grandparents were also teachers. The family was Baptist. While Warren Beaty was still a child, Ira Beaty moved his family from Richmond to Norfolk and then to Arlington and Waverly, then back to Arlington, eventually taking a position at Arlington's Thomas Jefferson Junior High School in 1945. During the 1950s, the family resided in the Dominion Hills section of Arlington. Beatty's older sister is the actress, dancer and writer Shirley MacLaine. His uncle, by marriage, was Canadian politician A. A. MacLeod.