Portrait of an unknown elderly man with a boy Dmitry Levitsky (Levitzky) (1735-1822)

The picture has something of this: people, portrait, son, baby, man, two, wear, royalty, Renaissance, offspring, affection, child, retro, jacket.
Perhaps it’s a painting of a man with his arm around a young boy’s shoulder, both of which is wearing a brown coat and a white shirt.