Never seen this...thank you!Could you tell me if this is Duke Christian with his wife Lovisa?If so,one of the children must be Prince Christian,husband of Princess Helena?
Even in exile their castle/palace of Primkenau looked quite lavish if we take a note that they were the exiled family of a relatively small Dukedom...
Look, this picture was made partly after Kmerov's beautiful painting.

You can see Christian-August II and his wife Louise-Sophie Danneskjold-Samsoe, with the children (left to right) Christian, Friedrich, Henriette, Caroline and Louise...
So Christian on the painting is the youg boy, in the left.