Summer Phoenix was born 10 December 1978 in Winter Park, Florida, United States to John Lee Bottom (1947) and Arlyn Sharon Dunetz (1944) .
Children
| Name | Birth | Death | Joined with |
| Indiana August Affleck (2004) | 31 May 2004 Los Angeles, California, United States | ||
| Atticus Affleck (2008) | 10 January 2008 Los Angeles, California, United States | ||
Siblings
| Name | Birth | Death | Joined with |
| River Phoenix (1970-1993) | 23 August 1970 Madras, Oregon, United States | 31 October 1993 West Hollywood, California, United States | |
| Rain Phoenix (1972) | |||
| Joaquin Phoenix (1974) | 28 October 1974 San Juan, Puerto Rico | Patricia Rooney Mara (1985) | |
| Summer Phoenix (1978) | 10 December 1978 Winter Park, Florida, United States | Casey Affleck (1975) | |
| Liberty Phoenix (1976) | |||