Possible Duplicate:
What is the correct possessive for nouns ending in s?
I just took a grammar quiz in 10th grade English Honors, and one of the questions was very interesting to me.
In this certain section of the quiz, we had to insert (we couldn't take something out) either a semicolon (;), a colon (:), an apostraphe ('), a hyphen (-), or a dash (--).
The sentence in question went like this:
Jack Walls, Chris Walls, and Jackie Wallses children were very upset when they got home.
I decided to take out the 'e' and insert an apostraphe between the two S's like so
Jack Walls, Chris Walls, and Jackie Walls's children were very upset when they got home.
I knew that I was told to only insert punctuation, but I decided to take the risk anyway. After class I went to my teacher and showed her. She says she might need to make the question a freebie.
Am I right, or is the correct version this?
Jack Walls, Chris Walls, and Jackie Wallses' children were very upset when they got home.