Yup, if we and our small survival group are on the verge of starving ourselves, adding new mouths to feed would be a no-no regardless of who or what they are, so there'd be tough decisions to make, like this one-
"Can I come with you please? I'm ever so hungry, mummy and daddy are asleep and won't wake up"
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Isn't ensuring that your group never gets to the point of starving, the reason you are prepping?
Cross every T and dot every i and that should never become an issue. Plan charity. It doesn't mean you take in every refugee that shows up but, turning them away with nothing may mean they are taken in by real organized raiders that will come against you and now they know where you are.
Lots to think about!