Johann Christoph Kellner
Johann Christoph Kellner( 15 August 1736 – 1803) was a German organist and composer.
He was the son of Johann Peter Kellner.
Johann Bernhard Bach the Younger
Johann Bernhard Bach( the younger; to distinguish him from an older family member with the same name)( 24 November 1700 – 12 June 1743) was a nephew of Johann Sebastian Bach.
He was a German composer and organist.
Johann Bernhard was born in and he died in Ohrdruf.
In 1721 he followed his father, Johann Christoph Bach, in the post of organist at St. Michael in Ohrdruf.
Christoph Bach (musician)
Christoph Bach  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 was married to 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.
Johann Michael Bach
Johann Michael Bach( baptised, Arnstadt, Schwarzburg- Sondershausen –, 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).
Johann Christoph Bach
Johann Christoph Bach( baptised – 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 – 4 November 1753), Johann Christoph Jr.( 29 August 1676 – 1738), Johann Friedrich( 1682–1730), and Johann Michael( 1685 – unknown).
Two of their grandsons later sailed to America and founded the Bach family there: Johann Heinrich Bach( 1709 – 1789) and Johann Wilhelm Bach( 1722– 1794).
He is not to be confused with Johann Sebastian Bach's son, Johann Christoph Friedrich Bach.
Johann Christoph had a reputation as a composer that was only equalled by that of Johann Sebastian within the Bach family during his lifetime.
He was organist at Eisenach and later a member of the court chamber orchestra there.
His brother, Johann Michael Bach( Johann Sebastian Bach's father- in- law and Maria Barbara's father), was also a composer.
Some of the works were later attributed to Johann Sebastian, but were recently recognized as written by Johann Christoph.
One of the most famous works is the cantata, based on the" Song of Solomon".
Despite his success as a musician, Johann Christoph experienced financial difficulties, which may have resulted in his not having been selected as the guardian of Johann Sebastian when the latter's parents died.
Yet Johann Christoph found the money to have his portrait painted in oil several times, including the well- known portrait of him that is on display in a Berlin museum.
Johann Christoph was heavily in debt when he died at Eisenach.
He died just ten days after his wife Maria died.
Sebastian Bach described him in his Genealogy( 1735) as" the profound composer", thus hinting at his reputation, not just within the family, but within society.
Johann Christoph Bach (musician at Arnstadt)
Johann Christoph Bach (22 February 1645 in Erfurt – in Arnstadt) was a German musician of the Baroque period.
A court and town musician in Arnstadt, he was the third son of Christoph Bach and the twin brother of Johann Ambrosius Bach.
He was the uncle of Johann Sebastian Bach.
He married Martha Elisabeth Eisentraut (1654–1719).
He is not to be confused with other Johann Christoph Bachs (see Bach family).
Johann Christoph Bach (organist at Ohrdruf)
Johann Christoph Bach( 16 June 1671 – 22 February 1721) was a musician of the Bach family.
He was the eldest of the brothers of Johann Sebastian Bach who survived childhood.
Johann Michael Bach (musician at Wuppertal)
Johann Michael Bach( 9 November 1745 in Struth near Schmalkalden – 13 June 1820 in Elberfeld) was a German composer, lawyer and music theorist.
He was a son of Johann Elias Bach( 1705 – 1755), and therefore a nephew of J. S. Bach.
He is not to be confused with his great uncle Johann Michael Bach( 1648 – 1694, brother of Johann Christoph Bach).
His main theoretical work was his" Kurze und systematische Anleitung zum General- Bass und der Tonkunst uberhaupt" published at Kassel in 1780.
Georg Christoph Bach
Georg Christoph Bach( 6 September 1642 – 27 April 1697) was a German composer.
He was the son of Christoph Bach and the elder brother of Johann Sebastian Bach's father Johann Ambrosius Bach.
Johann Ambrosius Bach
Johann Ambrosius Bach( 22 February 1645 –) 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.

Question: Who is the paternal grandfather of Johann Christoph Bach (Musician At Arnstadt)?
Answer: Johannes Bach