Chin fissures are controlled by a dominant gene, so it was a fifty-fifty chance, I guess. Your nose, mouth, and eyes won't end up just as they are now, but your chin dimple is one facial feature you're not going to grow out of. Take it from your old man. Just don't let it get to you when people talk about underlying bone peculiarity.
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At the hospital they were joking that Marga might want to order a maternity test to verify that she's Nora's mother.