Wedding Invitations & Paper

STD Address Wording

I have a question about wording the address for a particular situation.  My cousins are sisters (same last name)that live together, not with their parents.  They're both in their 20's.  I am not letting them bring guests as they are both single.  Should I send them one STD card with both their names on it or should I send them each one?  If I can send just one, how do I word it?  And is it the same for the invites?  TIA!
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