Third person plural pronoun is THEY.
If you want to create a possessive pronoun out of that one, that would be THEIRS.
Possessive pronouns, as the name itself says, determine some kind of possession. For example:
Is this books yours? - No, it's theirs.
Answer:
1. Freedom
2. Because the will have their own rights, because Americas a free country
3. They might feel bad, leaving everything they knew, but some might say its okay, because they just want to be free.
Opinion, a terrible opinion because Dallas Stars are the best, but opinion lol.