Bonjour,
Réponse :
2. I saw Laura and Steve with their children.
3. I saw Steve with his wife, Laura.
4. I saw Gary with his brother, Tim.
5. I saw Laura with her brother, Tim.
6. I saw Sarah and Philip with their son, Tim.
7. I saw Laura with her parents.
8. II saw Emma and Robert with their parents.
Explications :
his : son; sa; ses ( possesseur masculin )
her: son; sa; ses ( pessesseur féminin )
their : leur; leurs