When you invite a married person to do something, how do you word it to include their spouse?

How do you word it to mean only themselves?

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+1 y
I'm talking about a casual invitation not formal.
If you in any way don't know what I'm asking, don't bother to answer.
Updates
+1 y
This isn't hard to understand. I meant between friends and when family invites you over.
Nothing formal or semi formal.
Even after I said not formal I still got a "formal" answer
When you invite a married person to do something, how do you word it to include their spouse?
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