Well she's Harry's mother's sister. I'd have to reread The Half Blood Prince but if I remember correctly she did do something like asking for help at some point, even if it was just not to get rapped on the fingers. I don't have time to look it up.
If you have siblings, you know something of their professional occupations, like them or not. Lulls in conversation on family gatherings require that you give news of what you do of who you hang out with; and you do sometimes meet those people on occasions.
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