Исправьте ошибки: 1) my sister-in-law problems; 2) these books` author; 3) the mens` cars; 4) mikes house; 5) byron and shelly`s poems; 6) sarah`s and rachel`s room; 7) sheeps` owner; 8) charles toys.

1) My sister-in-law's problems; 2) the author of these books; 3) the men's cars; 4) Mike's house; 5) Byron's and Shelly`s poems; 6) Sarah and Rachel`s room; 7) sheep's owner; 8) Charle's toys.