Seems like it could become a problem very easily
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Why do shapeshifters need a family?
They could do a mitosis.
Can they recognize their mitosis sister?
If not, the worst case scenario would be an entire city taken over, Invasion of the Body Snatchers style, but every shape shifter thinks the rest of the city is normal people.
Wait, I've seen this one before.
Lol, that was my first thought when I saw the OP. Oglaf is great.
And here I was thinking I had an original thought... /s
Is that Oglaf? It looks like Oglaf...