>>1491697Since you're talking about grammar. Here are some errors you should correct.
>There's Person A, B, and C. There are Persons A, B, and C.
plural required, and a verb to agree with that number
>Person A and B meet.Persons A and B meet.
plural required
>All 3 people later are together. All three people are later together.
All three people are together later.
Later, all three people are together.
Your version is odd.
>Person C mentions how they're not good with strangers.That pronoun use is a problem. No idea if you're saying person C is saying they themself are not good with strangers or if C is saying B is not good with strangers.
>If they've already met once, is it proper to still call Person A a stranger?Again, whom? To whom is that they referring?
A and B have met. I think A could still be a stranger to B as they have made acquaintance but are by no means necessarily familiar. A and C have seemingly only met the once and therefore A would count still as a stranger to C.