Thank you for replying so quickly.
Fradrik de Ridder had a son William de Redder born c1813 at Blakeney, Norfolk. He was a ship's Captain, Merchant Navy, possibly at one time being Master of the ship Vimeira or Vimiera.
Fradrik also had a daughter, Maria, born c1812 aso at Blakeney, Norfolk.
Fradrik married Mary Baines c1795 at Blakeney, Norfolk.
Fradrik probably did not live long, since Mary remarried Anthony Drew in 1830 at Castle Acre, Norfolk.
They had a daughtet Mary Drew.
There may have been other children from the 2 marriages.
In view of the variation of spelling, it could be that Fradrik de Ridder was really Frederik or Frederic de Redder.
Is this of help? Many thanks for your kind response.