Aniston bi ni February 11, 1969, ni Los Angeles adugbo ti Sherman Oaks, ọmọbinrin ti Greek-bi osere John Aniston ati osere Nancy Dow. Ọkan ninu awọn rẹ iya nla-baba, Louis Grieco, wà lati Italy. Iya rẹ miiran ìran pẹlu English, Irish, Scottish, ati kan kekere iye ti Greek. Aniston ni o ni meji idaji-arakunrin, John Melick, rẹ agbalagba iya idaji-arakunrin, ati Alex Aniston, rẹ ọdọmọkunrin baba idaji-arakunrin. Aniston ká baba olorin ni osere Telly Savalas, ọkan ninu awọn ti o dara ju awọn ọrẹ ti baba rẹ. Bi a ọmọ kan o gbe si New York City.
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