5. i rode in my car on the trip to mexico.
aunts' and uncles'
aunt's and uncle
aunt's and uncle's
aunt and uncle's

Did you take many pictures during your trip ? 39. ... Oh, no, the car won't start! imp. ... 5. In March, I returned all of my library books. 6. At least one hundred people waited in line. 7. George and Hernando are walking to the park, I am riding my bicycle. 20.  5. The Spanish club (is, are) raising money for a trip to Mexico. 6.

I rode in my Aunt's and Uncle's car on the trip to Mexico.
Because when you see ( 's )
It means ownership.
Hope this helped :)

The correct answer is a