They pick up their toys, clean the dishes and brush the family's cat, Katrina.

WSJ: How I Spent My Allowance: Twins Buy Toys, but Help Cats, Too

Like nearly every work in this show, Manet's real interest was the brush mark of the trousers, tablecloth, lemon zest, vase, coffeepot and smudgy cat.

WSJ: Review: Manet's Different Strokes | 'Manet: Portraying Life' at the Royal Academy in London