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.