Trump's ancestors originated from the German village of Kallstadt in the Palatinate on his father's side, and from the Outer Hebrides in Scotland on his mother's side. All of his grandparents and his mother were born in Europe.  Trump's paternal grandfather, Friedrich Trump, first emigrated to the United States in 1885 at the age of 16 and became a citizen in 1892. He amassed a fortune operating boom-town restaurants and boarding houses in the Seattle area and the Klondike region of Canada during its gold rush. On a visit to Kallstadt, he met Elisabeth Christ and married her in 1902. The couple permanently settled in New York in 1905. Frederick died from influenza during the 1918 pandemic.  Trump's father Fred was born in 1905 in The Bronx. Fred started working with his mother in real estate when he was 15, shortly after his father's death. Their company, Elizabeth Trump & Son, was primarily active in the New York boroughs of Queens and Brooklyn. Fred eventually built and sold thousands of houses, barracks, and apartments. The company was later renamed The Trump Organization, after Donald Trump took charge in 1971.  Trump's mother Mary Anne was born in Tong, Lewis, Scotland. At age 18 in 1930, she emigrated to New York, where she worked as a maid. Fred and Mary were married in 1936 and raised their family in Queens.  Trump's uncle John was an electrical engineer, physicist, and inventor. He worked as a professor at MIT from 1936 to 1973. During World War II, he was involved in radar research for the Allies and helped design X-ray machines that were used to treat cancer.  Trump's ancestors were Lutheran on his father's side in Germany and Presbyterian on his mother's side in Scotland. His parents married in a Manhattan Presbyterian church in 1936. As a child, he attended the First Presbyterian Church in Jamaica, Queens, and had his Confirmation there. In the 1970s, his family joined the Marble Collegiate Church (an affiliate of the Reformed Church in America) in Manhattan. The pastor at that church, Norman Vincent Peale, author of The Power of Positive Thinking and The Art of Living, ministered to Trump's family and mentored him until Peale's death in 1993. Trump, who is Presbyterian, has cited Peale and his works during interviews when asked about the role of religion in his personal life.  Trump says he receives Holy Communion, but that he does not ask God for forgiveness. While campaigning, Trump referred to The Art of the Deal as his second favorite book after the Bible, saying, "Nothing beats the Bible." The New York Times reported that evangelical Christians nationwide thought "that his heart was in the right place, that his intentions for the country were pure".  Trump has had associations with a number of Christian spiritual leaders, including Florida pastor Paula White, who has been called his "closest spiritual confidant". In 2015, he received a blessing from Greek Orthodox priest Emmanuel Lemelson and in 2016, he released a list of his religious advisers, including James Dobson, Jerry Falwell Jr., Ralph Reed, and others. Referring to his daughter Ivanka's conversion to Judaism before her marriage to Kushner, Trump said: "I have a Jewish daughter; and I am very honored by that."  Trump said that he began his career with "a small loan of one million dollars" from his father. He appeared on the initial Forbes 400 list of wealthy individuals in 1982 with an estimated $200 million fortune, including an "undefined" share of his parents' estate. During the late 1980s he became a billionaire, and he made the Forbes World's Billionaires list for the first time in 1989, but he was absent from the Forbes 400 list following business losses from 1990 to 1995; he reportedly borrowed from his siblings' trusts in 1993. His father's estate, valued at more than $20 million, was divided in 1999 among Trump, his three surviving siblings, and their children.  When Trump announced his candidacy for the presidency on June 16, 2015, he released a one-page financial summary that stated a net worth of $8,737,540,000. The following month, he filed a 92-page Federal Election Commission (FEC) financial disclosure form and declared his net worth was "in excess of ten billion dollars". In his presidential announcement speech, he said his wealth would make him less indebted to large campaign donors. Forbes called his net worth estimate "a whopper", setting their own estimate at $4.1 billion in 2015. Trump's 2015 FEC disclosure reported $362 million in total income for the year 2014.  After Trump made controversial remarks about illegal immigrants in 2015, he lost business contracts with several companies; this reduced his Forbes estimate by $125 million. Consumer boycotts and reduced bookings may have further affected his brand value during the presidential campaign. Trump's 104-page FEC disclosure in May 2016 still claimed a total wealth over $10 billion, unchanged from 2015. The release of the Access Hollywood tapes in October 2016 put further pressure on his brand, but real estate experts predicted a positive rebound from becoming president.  In its 2018 billionaires ranking, Forbes estimated Trump's net worth at $3.1 billion (766th in the world, 248th in the U.S.) making him one of the richest politicians in American history. These estimates fluctuate from year to year, and among various analysts. In July 2016 Bloomberg News had pegged his wealth at $3 billion, calling it an increase thanks to his presidential nomination, whereas Forbes had ranked him 324th in the world (113th in the U.S.) with $4.5 billion just a few months earlier. The discrepancies among these estimates and with Trump's own figures stem mainly from the uncertain values of appraised property and of his personal brand.

Answer this question "Who was his father" by extracting the answer from the text above.
Trump's father Fred was born in 1905 in The Bronx. Fred started working with his mother in real estate when he was 15, shortly after his father's death.