Read the text and with the information given make sentences using the saxon genitive as shown in the example.
Hi! My name's Dave and I want you to know my family.
I live in a big house with my parents, Robert and Liz, my grandfather Martin and my brothers and sister. I have two older brothers, their names are John and Tom. John is seventeen and Tom sixteen. I also have a twin brother called Mark, we are always together. My sister Laura is twenty years old and she has a boyfriend , David. David is a teacher in my school.