Bags, don’t argue with your fiancee.
In your “Mormon’s say”, the word “say” is not a noun, and there is no reason to use the possessive form of “Mormon”.
The word “say” is a verb and its subject is “Mormons”.
Mormons are performing the action of saying something.
Think of this sentence: The FR women love bagster.
The women are performing the action of loving. No possessive form is needed. (But blu becomes a little possessive when the other FR chicks are after you.)
Then please explain the term "had my say".
Never go up against a Bagster when the misuse of words for humor's sake is on the line.
Just doing my job. The Bagman feels that a certain amount of competition enhances his...uh...shall we say draw?