correct use of apostrophes

[marnie]

In signing greeting cards, etc...what is the correct way of signing your family's last name?? Love, the Smith's or Love, the Smiths? Thanks.

[Fizi]

In signing greeting cards, etc...what is the correct way of signing your family's last name?? Love, the Smith's or Love, the Smiths?

You only need the basic plural here. Smiths.