in third person omniscient narration the narrator has a gods eye view of the story and is privy to all characters thoughts as well as knowledge of the past and future. Then there's third person limited when the narrators innately tied to it then that's how you will know.
Answer:
well, when a person is American, speaks in English American and is fully acquainted with American cultures and rituals.
We went out for something to eat, (After) the dance was finished.
Billy's father says they can't stay with grandpa and grandma cook because he and Billy's mother are getting a divorce.
Because of the fact that Billy's parents are separating, he can no longer stay with his grandparents, but rather go to a court where the judge will decide where the child will live from now on - whether that is going to be with his mom or his dad.