Question

Billy's father says they can't stay with grandpa and grandma cook because

Answer 1

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.

Answer 2

1) he and Billy’s mother are getting a divorce. 2) their grandmother.  3) his Italian heritage 4) neighborhood decay. 5)are learning English as quickly as immigrants did in the past.  6) get along on a one-on-one basis.  7) learn English 8) present perfect progressive  9) gone  10) went