Summer Phoenix Biography
Born on 10 December 1978, Summer Joy Phoenix is the fifth and youngest child of Arlyn and John Phoenix, a carpenter. Summer was raised in Southern California, but spent her teen years in Central Florida, where she was born. She is an active supporter of numerous charities and activist groups, mainly concerning the environment, animal rights and vegetarianism. Summer has also appeared in many print ads in Europe.
Summer is married to actor Casey Affleck.
Trivia

Born at 2:34 AM EST

Sister of River Phoenix, Joaquin Phoenix, Rain Phoenix and Liberty Phoenix.

Attended New York University's Tisch School of the Arts film school. [January 1997 - May 1998]

April/May 2002: Appeared at London's Garrick Theatre, in "This Is Our Youth", alongside Matt Damon and Casey Affleck.

Wrote/Played some piano pieces on her sister Rain Phoenix's new CD.

Became engaged to boyfriend actor Casey Affleck over Christmas 2003.

Gave birth to son, Indiana August, May 31, 2004 in Amsterdam

Is a member of "The Paper Cranes", an alternative band that plays the New York City club scene. She plays the Rhodes, piano and guitar. They have released an EP and have plans to produce more. Her sister, Rain Phoenix, is the band's lead vocalist. "Paper Cranes" plays mostly shows in Gainesville, Florida.

Appears in Girl (1998) with Sean Patrick Flanery, who, like her brother River Phoenix, played the young Indiana Jones.

Together with business partners Odessa Whitmire and Ruby Canner, Summer opened a West Coast branch of her fashion boutique Some Odd Rubies. The new store is located in Los Angeles.

Welcomed second child, son Atticus Affleck [November 2007] with Casey Affleck.
Source provided by imdb (Copyright) - The Internet Movie Database.