You'd have thought that having a beard would mark Jean-Michel out as being very visibly different from his sister Genevieve, but when you put their images side by side like this, it doesn't make as big a difference as you might expect.
The fact that the siblings are so close together in age reinforces the strong family resemblance between the two of them. Aside from the facial hair, the only other noticeable difference is in the eyebrows. Unusually for mixed-gender siblings, they have the same lips.