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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。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 ]][[enior 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。

他自2012年開始與美國[[超級名模]][[卡莉·克勞斯]]交往。<ref>{{Cite news|url=http[https://www.elleukthenews.com.pk/fashionlatest/news/a29378/an736909-baby-exclusiveon-interviewboard-withfor-karlie-kloss/|title=Karlie Kloss on why knowledge is power|date=2016-02and-18|first=Lotte|last=Jeffs|website=elleuk.com|publisher=ELLE UK|language=en|accessdate=2017joshua-01kushner-25|archiveurl=https://web.archive.org/web/20170211064800/http://www.elleuk.com/fashion/news/a29378/ancouple-exclusiveexpecting-interviewfirst-withchild Baby on-karlie-kloss/|archivedate=2017-02-11|deadurl=no}}board for Karlie Kloss and Joshua Kushner]，thenews，October 30,2020</ref>兩人在2018年10月18日完婚，<ref>[https://people.com/style/joshua-kushner-karlie-kloss-new-wedding-photo-best-friend/ “Joshua Kushner Shares Previously Unseen Wedding Photo of Karlie Kloss: 'I Married My Best Friend'”] . People. 22-10-2018.</ref>并在2021年3月迎来第一个孩子。<ref>[https://people.com/parents/karlie-kloss-welcomes-first-child-with-husband-joshua-kushner/ “Karlie Kloss Welcomes First Child with Husband Joshua Kushner”] People [14-03-2021]</ref>