I'm searching for descendants of Christopher Henrich Kastel (birth unknown) and wife Helena Kastel (born 1710). She died 17.10.1784 in Nybol parish in Schleswig, leaving behind two sons, Jorgen Christopher in London, and Georg Christian who was born 1744, and died 1811 in Denmark. If anyone has information that could shed light on the brother in London, I would be very grateful.