There are two more family portraits - possibly of their two sons, Nicholas William Prettejohn Pitts and Thomas Harris Pitts. They were sold to a dealer in Wales in 1991. If anyone knows of the whereabouts of these portraits:
South Allington House
The Pitts Family Home
Nicholas was 50 when his portrait was completed in July 1850.
Elizabeth was 30 when her portrait was completed at South Allington House in September 1842.
The artist was John Ponsford.