Question: Who is Jared Kushner's father-in-law?

Context paragraphs:
Joshua Kushner: Joshua Kushner (born June 12, 1985) is an American businessman and investor.  He is the founder and managing partner of the investment firm Thrive Capital, co-founder of Oscar Health, and the son of real estate magnate Charles Kushner.  His brother is Jared Kushner, the son-in-law and senior advisor of the US President Donald Trump.

Office of American Innovation: The Office of American Innovation is an office within the White House Office created by the Trump administration.  The purpose of the office is to reduce federal bureaucracy.  It is directed by Jared Kushner.

Charles Kushner: Charles Kushner (born May 16, 1954) is an American real estate developer.  He founded Kushner Companies in 1985.  In 2005, he was convicted of illegal campaign contributions, tax evasion, and witness tampering, and served time in federal prison.  After his release, he resumed his career in real estate.  His son is Jared Kushner, who is the husband of Ivanka Trump and son-in-law and senior advisor to President of the United States Donald Trump.

Jared Kushner: Jared Corey Kushner (born January 10, 1981) is an American investor, real-estate developer, and newspaper publisher who is currently senior advisor to US President Donald Trump.  Kushner is the elder son of real-estate developer Charles Kushner, and is married to Trump's daughter Ivanka.  He was chief executive officer of the real-estate holding and development company Kushner Companies, and of Observer Media, publisher of the "New York Observer".  He is the co-founder and part owner of Cadre, an online real-estate investment platform.

Kushner Companies: Kushner Companies is an American real estate developer and lender in the New York City metropolitan area.  The company's biggest presence is in the New Jersey residential market.  It also owns the Puck Building in New York City.  Its founder, Charles Kushner, was convicted of tax evasion and witness tampering in 2005, and served time in federal prison, and as a result, he handed over the management of the company to his son Jared Kushner.

Joseph Kushner: Joseph Kushner (October 10, 1922 – October 5, 1985) was an American real estate magnate, and the father of Murray Kushner and Charles Kushner, and grandfather of Jared Kushner, Joshua Kushner, and Marc Kushner.  He came to the US as a Holocaust survivor from Belarus in 1949.  At the end of his career, he handed out to his successor control of 4,000+ apartments, houses, and properties.

Trump campaign–Russian meeting: On June 9, 2016, a meeting was held in Trump Tower in New York City between three senior members of the presidential campaign of Donald TrumpDonald Trump Jr., Jared Kushner, and Paul Manafortand at least five other people, including Russian lawyer Natalia Veselnitskaya.  The meeting was arranged by publicist and long-time Trump acquantiance, Rob Goldstone on behalf of his client, singer-songwriter Emin Agalarov.  It was disclosed to U.S. government officials when Kushner filed a revised version of his security clearance form.

Ivanka Trump: Ivanka Trump ( born Ivana Marie Trump; October 30, 1981) is an American television personality, fashion designer, author and businesswoman who is an advisor to the President of the United States, Donald Trump.  She is the daughter of the president and his first wife, former model Ivana Trump.

Navahrudak: Navahrudak (Belarusian: Навагрудак ), more commonly known by its Russian name Novogrudok (Новогрудок) (Lithuanian: "Naugardukas" ; Polish: "Nowogródek" ; Yiddish: נאָווהאַרדאָק‎ "Novhardok") is a city in the Grodno Region of Belarus.  In the 14th century it was an episcopal see of the Metropolitanate of Lithuania.  It is a possible first capital of the Grand Duchy of Lithuania, with Trakai also noted as a possibility.  It was later part of the Polish-Lithuanian Commonwealth, the Russian Empire and eventually Poland until the Soviet invasion of Poland (1939) when the USSR annexed the area to the Byelorussian SSR.  After the election of American president Donald Trump, the town gained fame as the hometown of the mother of Trump's son-in-law and advisor Jared Kushner.

Observer Media: Observer Media is an American print and online media company.  The company was formed through several acquisitions, including acquisition of the New York Observer in 2007.  Observer Media is based in lower Manhattan, New York City, and is owned by businessman Jared Kushner.  It currently publishes the "Commercial Observer", observer.com, and Commercialobserver.com.  As of November 2016, Observer Media announced it would no longer print the New York Observer.  The observer.com site is a consolidation of several notable online properties, including "The Gallerist", "BetaBeat", "NY Politicker", and "PolitickerNJ".

Supporting paragraphs: Jared Kushner Ivanka Trump
Answer: Donald Trump