Title: Johann Sebastian Bach
Content:   Johann Sebastian Bach was born in Eisenach, the capital of the duchy of Saxe-Eisenach, in present-day Germany, on 21 March 1685 O.S. (31 March 1685 N.S.). He was the son of Johann Ambrosius Bach, the director of the town musicians, and Maria Elisabeth Lämmerhirt. He was the eighth and youngest child of Johann Ambrosius, who likely taught him violin and basic music theory. His uncles were all professional musicians, whose posts included church organists, court chamber musicians, and composers. One uncle, Johann Christoph Bach (1645–1693), introduced him to the organ, and an older second cousin, Johann Ludwig Bach (1677–1731), was a well-known composer and violinist. Bach's mother died in 1694, and his father died eight months later. 
Title: Johann Ambrosius Bach
Content:  Johann Ambrosius Bach (22 February 1645 &ndash; 2 March 1695) was a German musician, father to Johann Sebastian Bach. The son of Christoph Bach (1613–1661), Ambrosius was born in Erfurt, Germany, as the twin brother of Johann Christoph Bach (1645–1693). Ambrosius was employed as a violinist in Erfurt. In 1671, he moved his family to Eisenach, in present-day Thuringia, where he was employed as a court trumpeter and director of the town musicians. He married his first wife Maria Elisabeth Lämmerhirt on 1 April 1668, and had eight children by her, four of whom became musicians, including Johann Sebastian Bach, the famous German Baroque composer and musician. She was buried on 3 May 1694. On 27 November 1694 he married Barbara Margaretha, née Keul (she had already been twice widowed). He died in Eisenach less than three months later. After Johann Ambrosius Bach's death, his two children, Johann Jacob Bach and Johann Sebastian Bach, moved in with his eldest son, Johann Christoph Bach.
Title: Christoph Bach (musician)
Content:  Christoph Bach (29 April 1613 &ndash; 22 September 1661) was a German musician of the Baroque period. He was the grandfather of Johann Sebastian Bach. According to information provided by Johann Sebastian Bach in his genealogy Origin of the Musical Bach Family written in 1735, Christoph Bach was the second son of Johannes Bach. His brothers, Johann Bach and Heinrich Bach, were also composers. He was born in Wechmar, Germany, where he became a court musician. He also held town musician posts in Erfurt and in Arnstadt. Christoph Bach married Maria Magdalena Grabler. They had three sons, who were all musicians: Georg Christoph Bach (1642–1697), and the twins Johann Ambrosius Bach (1645–1695), who was Johann Sebastian Bach's father, and Johann Christoph Bach (1645–1693). Christoph Bach died in Arnstadt.
Title: Johann Gottfried Bernhard Bach
Content:  Johann Gottfried Bernhard Bach (11 May 1715 – 27 May 1739) was a German musician. It is not known whether he composed, and his career as an organist is not in itself notable, but his life throws light on his famous father, the composer Johann Sebastian Bach. Johann Gottfried was the fourth child of Johann Sebastian Bach and Maria Barbara Bach to reach adulthood.
Title: Johann Christian Bach
Content:  Johann Christian Bach was born to Johann Sebastian and Anna Magdalena Bach in Leipzig, Germany. His distinguished father was already 50 at the time of his birth—an age gap exemplified by the sharp differences in the musical styles of father and son. Even so, father Bach instructed Johann Christian in music until his death in 1750. After his father's death, he worked (and lived) with his second-oldest half brother Carl Philipp Emanuel Bach, who was twenty-one years his senior and considered at the time to be the most musically gifted of Bach's sons. He enjoyed a promising career, first as a composer then as a performer playing alongside Carl Friedrich 
Title: Veit Bach
Content:  Vitus "Veit" Bach (around 1550 – 8 March 1619, Wechmar) was a baker and miller who, according to Johann Sebastian Bach, founded the Bach family, which became one of the most important families in musical history. Veit's son, Johannes Bach (Wechmar) (ca. 1580–1626), was the grandfather of Johann Ambrosius Bach, J.S. Bach's father, Veit therefore being Johann Sebastian's great-great-grandfather. There are other theories which hold that a different Veit Bach who died before 1578 in Erfurt was the father of Johann(es)/Hans, and was thus Johann Sebastian's great-great-grandfather. Evading religious persecution in the Kingdom of Hungary, then under the control of the staunchly Roman Catholic Habsburgs, Bach, being a Protestant, settled in Wechmar, a village in the German state of Thuringia. His descendants continued to live there until Christoph Bach, grandfather of J. S. Bach, moved to Erfurt to take up a position as municipal musician or Stadtpfeifer (town piper). Bach's son Johannes Bach studied music with the town's head piper.
Title: Bach (surname)
Content: Johann Sebastian Bach ("JSB", 1685–1750), composer and organist, the most well-known of the Bachs ; Wilhelm Friedemann Bach (1710–1784), composer and organist, son of JSB ; Carl Philipp Emanuel Bach (1714–1788), composer, harpsichordist and pianist, son of JSB ; Johann Aegidius Bach (1645–1716), organist and conductor, uncle of JSB ; Johann Ambrosius Bach (1645–1695), violinist and trumpeter, father of JSB ; Johann Bernhard Bach (1676–1749) composer, harpsichordist and organist, cousin of JSB ; Johann Christoph Friedrich Bach (1732–1795), composer, son of JSB ; Johann Christian Bach (1735–1782), composer, son of JSB ; Johann Christoph Bach (1642–1703), composer and organist, great-uncle of JSB ; Johann Gottfried Bernhard Bach (1715–1739), organist, son of JSB ; Johann Ludwig Bach (1677–1731), composer and violinist, second cousin of JSB ; Johann Michael Bach (1648–1694), composer and organist, great-uncle and father-in-law of JSB ; Johann Michael Bach III (1745–1820), composer and lawyer, nephew of JSB ; Johann Sebastian Bach (painter) (1748–1778), painter, grandson of JSB 
Title: Johannes Bach
Content:  Johann or Johannes Bach (26 November 1604 – buried 13 May 1673) was a German composer and musician of the Baroque. He was the father of the so-called "Erfurt line" of Bach family musicians. Born in Erfurt, Johannes was the eldest son of Johannes Hans Bach and the brother of Christoph Bach and Heinrich Bach. All three were composers. He spent seven years studying under Johann Christoph Hoffmann, a stadtpfeifer in Suhl. From 1634 he served as organist at St. Johannis church in Schweinfurt, and was later organist at Suhl. In 1635 he became town musician and director of the Raths-Musikanten in Erfurt, and was organist at the town's Predigerkirche from 1636. His first wife, Barbara Hoffman (a daughter of his teacher), died half an hour after bearing a stillborn son in 1639. Following this he married Hedwig Lämmerhirt, the daughter of a town councilman in Erfurt. His children from this marriage included Johannes Christian Bach, Johann Aegidius Bach, and Johann Nicolaus Bach. Bach's works included two motets, Unser Leben ist ein Schatten and Sei nun wieder zufrieden, and an aria, Weint nicht um meinen Tod.
Title: Johann Michael Bach
Content: To be distinguished from Johann Michael Bach (1745–1820)  Johann Michael Bach (baptised 19 August 1648, Arnstadt, Schwarzburg-Sondershausen &ndash; 27 May 1694, Gehren) was a German composer of the Baroque period. He was the brother of Johann Christoph Bach, as well as first cousin, once removed and father-in-law of Johann Sebastian Bach (he was the father of J.S. Bach's first wife Maria Barbara Bach). He is sometimes referred to as the "Gehrener Bach" to distinguish him from the "Wuppertaler Bach", Johann Michael Bach (1745–1820).
Title: Johann Christoph Bach
Content:  Johann Christoph Bach (baptised 18 December 1642 &ndash; 31 March 1703) was a German composer and organist of the Baroque period. He was born at Arnstadt, the son of Heinrich Bach, Johann Sebastian Bach's first cousin once removed and the first cousin of J.S. Bach's father, Johann Ambrosius Bach. He was also the uncle of Maria Barbara Bach, J. S. Bach's first wife and second cousin. Johann Christoph married Maria Elisabeth Wiedemann in 1667. They had seven children, including four sons who became musicians: Johann Nicolaus (10 October 1669 &ndash; 4 November 1753), Johann Christoph Jr. (29 August 1676 – 1738), Johann Friedrich (1682–1730), and Johann Michael (1685–unknown). 

Question: Who is the father of Johann Sebastian Bach?
Answer: Johann Ambrosius Bach.