Edward is the father of Marcus.
Edward is Marcus's father
Mr. Johnson is the new Math teacher of the students
Mr. Johnson is the students' new Math teacher.
The names of the people are on the list.
The people's names are on the list.
The toy of the boy
The boy's toy
That's the room of the teachers.
That's the teachers' room.
The news of today were shocking.
Today's news were shocking.
The palace of the Queen.
The Queen's palace
These are the bikes of my friends.
These are my friends' bikes.
The cat of Thomas and Jessica.
Thomas and Jessica's cat.
The food bowls of the dogs are empty.
The dogs' food bowls are empty.
The room of the sisters.
The sisters' room
The desk of my boss.
My boss's desk