I'm still not very sure what you wanted for an answer but I hope this helps:
1. The Smiths' dog
2. Words with U's and O's
3. Twenty-five years worth
4. Sixth graders' graduation
5. I'm in the class of '19.
6. Mother-in-law's purse
7. The forty-two cats of the Joneses.
8. The Union's flag in '63.
9. She's a nine-year-old girl.
10. Threes B's and two D's in my name.