To be or Possessive CaseSam's Bob's granddad.Lilly's John's uncle.• Tom's father.Tom's a father.• He's happyLiz's uncle's a doctor.• Liz's uncle's doctor​

Sam's (to be) Bob's (possessive case) grandad

Lilly's  (to be) John's (possessive case) uncle

Tom's father (possessive case)

Tom's a father  (to be)

he's happy  (to be)

Liz's  (possessive case) uncle's  (to be) a doctor

Liz's  (to be) uncle's  (possessive case) doctor