Which brother gave Johann Sebastian Bach his first formal keyboard lessons?

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Painting by Elias Gottlieb Hausmann of Johann Sebastian Bach wearing a dark coat with a white shirt and holding a sheet of music in his left hand. — Johann Sebastian Bach Johann Sebastian Bach.

Johann Sebastian Bach received his first formal keyboard lessons from his eldest brother, also named Johann Christoph (1671–1721), who was an organist at Ohrdruf.1

After the death of both his parents in 1695, Bach was placed under the care of this brother, who had previously been a pupil of the influential composer Johann Pachelbel.1