78. Replace the of-phrase by the nouns in the possessive case. Model: the son of my sister – my sister’s son 1. the sons of my sisters 2. the books of Peter 3. the wife of Dr Sandford 4. the daughter of his son 5. the brother of Mary 6. the sister-in-law of Dr Sandford 7. the name of my sister 8. the friends of our cousin 9. the niece of my husband 10. the teacher of her son