What is the plural of Davis family?
If the name ends in s, z, ch, or sh, you need to add es. That means the Davis family becomes the Davises, the French family becomes the Frenches, the Hernandez family becomes the Hernandezes, and the Glaves family becomes the Glaveses.
Names are proper nouns, which become plurals the same way that other nouns do: add the letter -s for most names (“the Johnsons,” “the Websters”) or add -es if the name ends in s or z (“the Joneses,” “the Martinezes”).
According to Grammarbook.com, the nerds of the world will argue heatedly on the subject for eternity, but the most roundly accepted rule is to include the apostrophe, along with an extra “S.” (Davis's rather than Davis').
Don't use an apostrophe to make your last name plural. Apostrophes can be used to show possession—à la the Smithsʼ house or Tim Johnsonʼs pad— but they don't indicate there's more than one person in your family.
The only time you would add the apostrophe is for possession: Welcome to Kerry Smith's Home or Cole and Kerry Smiths' Home. So if we're making signs, for instance, we'd say: Welcome to the Smiths, Welcome to the McBrides, Welcome to the Davises, Welcome to the Joneses, Welcome to the Hesses.
Remember: the only time you add an apostrophe to a last name is if you are making your last name possessive. For example, "That is the Gamels' house on the corner."
All you need is an “s” at the end of the name (Smiths, Johnsons). If you have trouble remembering whether the apostrophe is necessary, think of your message. For instance, if you mean to say, “The Smiths live here,” then you don't need the apostrophe on the sign or that sentence.
If you want it boiled down to something simpler, remember this one thing: NO APOSTROPHES. Got it? NO APOSTROPHES. Not in your own name, either: sign it “With warm holiday wishes from the Jameses,” not “the James's” or “the James' ” or “the Jameses',” or, heaven help us, “The Jame's.” Why?
Jones = Mr. Jones's. Some people favor adding only an apostrophe to a singular noun ending in s, but if you follow the rule, you can't be wrong. If a plural noun does not end in an s, you must make it possessive by adding an apostrophe and an s: women's; children's.
An apostrophe is needed after the final s to show possession (i.e., the Joneses own the house). An apostrophe is not needed with Mrs. Jones because there is no ownership.
What is the plural of Jones family?
The Joneses is correct because it indicates more than one member of the family. The Joneses' indicates possession, as in the Joneses' home.
...
The correct spelling of plurals usually depends on what letter the singular noun ends in.
- To make regular nouns plural, add –s to the end. ...
- If the singular noun ends in –s, –ss, –sh, –ch, –x, or –z, add -es to the end to make it plural.

All you need is an “s” at the end of the name (Smiths, Johnsons). If you have trouble remembering whether the apostrophe is necessary, think of your message. For instance, if you mean to say, “The Smiths live here,” then you don't need the apostrophe on the sign or that sentence.
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