Apostrophie help please!

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So I'm being organised and ordering some Christmas presents! They are candle holders with a sign, "Christmas at the Smiths" does the apostrophe go after the end of the name, "Smiths' " or before the s, "Smith's". Thanks in advance!

Smiths'

Thank you! That was my thought but the website has it before the "s", I'll have to make my wishes clear!!

Unless you are talking about a singular blacksmith

Psst.....OP....you've misspelled apostrophe

I'm not sure if it needs an apostrophe....

Yes it does glittery. The word "house" is implied.
"Christmas at the Smiths' house"

"Christmas WITH the Smiths" wouldn't need an apostrophe.