Keyser, Nicaise de – Portrait of the sons of Prince Gorchakov Hermitage ~ part 06

The picture has something of this: people, two, woman, wear, portrait, facial expression, girl, son, man, offspring, dress, three, child, retro, group, music, indoors, furniture.
Perhaps it’s a painting of two children, one reading a book and the other looking at a book with her hand on her chin, with a red curtain in the background.