 From this encounter, Sharp's younger brother Granville went on to become an early advocate for the abolition of slavery and remained so for fifty years.While Sharp and his immediate family were living on the Thames in a barge, a wider family group, consisting principally of Sharp and several of his brothers and sisters, was in the habit of meeting regularly to play music to entertain guest audiences.Although other musicians joined them, the core players were Sharp himself (organ and French horn) his brother James (bassoon and serpent), his younger brother Granville (clarinet, oboe, kettledrums, flute and harp), and several sisters who sang and played the piano.