Positive
The ... bikes are at their house. (boys)
The boys' bikes are at their house.
This is ... bike. (Sam)
This is Sam's bike.
My family and I / garage
My family and I don't have a garage
This is ... garden. (Steven and Emma)
This is Steven and Emma's garden.
Arthur and Steven / food
Do Arthur and Steven have food?
My ... friends came for dinner. (parents)
My parents' friends came for dinner.
All the houses / yard
All the houses doesn't have a yard
The ... father is working. (children)
The children's father is working.