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約書亞·庫許納在[[美國]][[紐澤西州]][[利文斯頓]] (Livingston, New Jersey)的[[美國猶太人|猶太]]家庭中長大。{{cite web|url=http://www.jspace.com/news/articles/forbes-features-members-of-the-tribe-in-30-under-30/6811 |title=Forbes Features Members of the Tribe In 30 Under 30|publisher=Jspace.com|date=2011-12-29|accessdate=2013-11-07|language=en |archiveurl=https://web.archive.org/web/20120130044117/http://www.jspace.com/news/articles/forbes-features-members-of-the-tribe-in-30-under-30/6811 |archivedate=2012-01-30 |deadurl=yes }}</ref> 他的母親為謝莉爾·庫許納（{{lang|en|Seryl Kushner}}），娘家姓斯塔茂爾（{{lang|en|Stadtmauer}}），父親為淨資產總額約5億美元的知名房地產商開發商{{le|查爾斯·庫許納|Charles Kushner}}。{{Cite web |title=The 26-Year-Old VC Who Cashed In On Instagram |url=http://www.forbes.com/sites/stevenbertoni/2012/05/02/the-26-year-old-vc-who-cashed-out-in-instagram/ |website=forbes.com |publisher=Forbes |first=Steven |last=Bertoni |date=2012-05-02 |accessdate=2016-01-02 |language=en |archiveurl=https://web.archive.org/web/20160304055418/http://www.forbes.com/sites/stevenbertoni/2012/05/02/the-26-year-old-vc-who-cashed-out-in-instagram/ |archivedate=2016-03-04 |deadurl=no }}</ref>他的哥哥[[傑瑞德·庫許納]]在2003年從[[哈佛大學]]畢業後掌管家族的房地產事業，是[[美國總統]][[唐納·川普]]女兒[[伊凡卡·川普]]的丈夫，現為{{link-en|美國創新辦公室|Office of American Innovation}}主任及{{link-en|美國總統高級顧問|Senior Advisor to the President of the United States}}。約書亞於2008年自[[哈佛大學]]畢業，2011年取得[[哈佛商學院]]碩士學位。