Some may argue that “Melvin’s’s’ Mustard Sauce Recipe” or “Melvin’s BBQ’s’s Mustard Sauce” could be technically correct; however, it looks awkward and confusing. Where possible, we recommend a rewrite to avoid the possessive case: Melvin’s BBQ Mustard Sauce, Melvin’s BBQ Mustard Sauce Recipe. See our post Apostrophes and False Possessives for more information.

The following are grammatically correct:
Mr. Davis’s account
It’s the company’s aim to help our consumers.
Our consumers’ expectations are extremely high.

If you are describing a position in a formally titled division or department, we would treat “Weights and Measures” as a capitalized proper noun phrase and “official” as a lowercased descriptive title: “Weights and Measures official.” Also refer to our posts Capitalization of Job Titles and When to Capitalize People’s Titles.

Is it “Weights and Measures’ Official”?

Or, is it just “Weights and Measures Official”; or …?

Thank you for your assistance with this.

The line between a possessive or genitive form and a noun used attributively is sometimes fuzzy. Whether you use the possessive Leaders’ or the word Leaders as a descriptive adjective to modify the noun Meeting is a matter of style and preference. Either is grammatically correct. See our post Apostrophes and False Possessives.

In legal writing, the Souter approach (possessive = ‘s after everything–including words ending in s–unless it’s Biblical or Classical) is the only acceptable approach.

In truth, the Souter approach should be the preferred method, regardless, since the following all say this is standard:
The Elements of Style;
The Chicago Manual of Style;
A Dictionary of Modern Legal Usage;
Fowler’s Modern English Usage;
U.S. Government Printing Office, Style.

It is also included as a rule in Georgetown University Law Center’s guide for effective punctuation in legal writing.

In fact, the only manual that allows for the dropping of the s after the apostrophe in any writing is The Associated Press Stylebook. However, Wilson Follett’s Modern American Usage is fine with either (which isn’t saying much about its reliability, rule-wise).

Furthermore, in legal writing, when in doubt refer to usage in SCOTUS Opinions. It could be the difference in looking like a hack to seasoned attorneys or looking knowledgeable.

For example, in a recent poll Westlaw took of currently licensed and practicing attorneys, 65% of of those under the age of 45 stated they believe the word “pled” is a valid legal term (it is not) and use it in their pleadings and writings. The proper term, of course, is “pleaded.” Pled is a word, but not a legal term.

I run a law firm and tell my new associates, “When in doubt, refer to SCOTUS.” In the entire existence of the Supreme Court of the United States, apparently no Justice has ever used the word “pled.” The only exception for this is when Justices have been required to cite a direct quote from a source that incorrectly used it.

Use the plural possessive “Welcome to the Cateses’.”