The plural possessive form of "smith" is "smiths'".
mr smith
The Smith's dog.
Mrs. Smith
None of them are ever great
It should be Mr. and Mrs. Smith's house.
Mr and Mrs smith
You should say "The Smiths are my friends" since you are referring to the group of individuals known as the Smith family. The use of "Smith's" in this context implies possession, which is not the intended meaning.
It's a character on Rick & Morty that's a family friend of the Smiths.
dear Sirs:
The cast of Mr. Hitchcock Meets the Smiths - 2004 includes: Peter Bogdanovich as himself Richard Franklin as himself Patricia Hitchcock as herself Richard Schickel as himself
The singular form of the plural noun smiths is smith.The singular possessive form is smith's.example: I bought this at a goldsmith's shop on Main Street.