This family was obviously almost as enamored with Colette's work as the artist himself. We saw Ismaelle earlier on with her grandmother Ginette. Then we saw Ginette with Ismaelle's father. Now here's Ismaelle for a second time, with her younger brother!
This is probably the least-similar genetic portrait of the whole family. There's still an obvious family resemblance, but it's very easy to see where Ismaelle ends, and Nathan begins. Perhaps he takes more after his mother.