Possessive 's
The cat of the kid.
The kid´s cat
The computer's teacher is there.
Incorrect.
The teacher's computer is there.
The computer of the teacher.
The teacher's computer.
Susan's cat is up there!
Correct
The kids of Marco.
Marco's kids.
Samuels restaurant is awezome.
Incorrect.
Samuel's restaurant is awezome.
The toy of the dogs.
The dogs' toy.
The kids's toys are here.
Incorrect.
The kids' toys are here.
The cat of Marco.
Marcos's cat.
Correct