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The rule for plural possessives is unchanged (add an apostrophe to the plural form). It would be:
That is Jay Smith's house.
That is the Smiths' house.
If, by some stroke of ill fortune, a person's last name were "Smiths," it would be:
That is Jay Smiths's house. (A parallel example might be That is Jay Jones's house. but That is the Joneses' house.)
Re: ~*~rssn~*~ s/o grammar ?
The rule for plural possessives is unchanged (add an apostrophe to the plural form). It would be:
That is Jay Smith's house.
That is the Smiths' house.
If, by some stroke of ill fortune, a person's last name were "Smiths," it would be:
That is Jay Smiths's house. (A parallel example might be That is Jay Jones's house. but That is the Joneses' house.)