I have a few choice family members who feel it unnecessary to RSVP to ANYTHING. Both guilty parties are families of 5 and of 6, so that's a good table or 2 at the wedding. They've historically failed to RSVP and will either only respond if followed up with directly, multiple times, after RSVP dates have passed, or casually mention 2 or 3 of them will show up. I even once got a 'i'll try to make it' like that helps. If they weren't immediate family members, I wouldn't even invite them...but family politics blah blah blah. My sister had a destination wedding and they didn't even bother RSVPing for that!
How do I put on my RSVP cards "no response means you're not coming"? I honestly don't think some of these buffoons get it. I'm not dealing with it, or chasing them down for a response. I don't care if it's rude, I think it's more rude to not RSVP.
So, any suggestions on how to be politely aggressive?!
Re: RSVP verbiage - No response means not coming??!
So, you're going to treat rudeness with rudeness? And be rude to EVERYONE in the process because of two families?
Some people just suck at responding and need prompts. Do you really think writing "No response means you're not coming" is going to magically make them think it applies to them and they'll respond? Meanwhile, I would find it really off-putting if I am someone who is generally respectful and responds and finds you wrote something like that on your invitations. And I'll bet you'll get the exact opposite of what you want, because people who can't attend will think they don't need to respond because you've just told them you'll make the assumption and you could have 50 people instead of 10-12 that will make you wonder if their responses got lost or if they really aren't coming.
If you don't want to chase them down, don't chase them down. Talk to them personally once before invites go out explaining that you need to make a firm commitment yes or no by the RSVP deadline or you won't have enough seats. Or give them one polite courtesy voicemail after the deadline that says "I need to give my venue final numbers by Wednesday at noon, so I must hear from you by then if you're coming or I won't have a seat or dinner available for you. Thanks." But don't treat everyone like idiots because you don't want to deal with two families.
I'd just say, "Since you haven't RSVPd to our invitation yet, I'm following up to find out if you're planning to come. If you are, I need to hear from you to that effect by Date. If I haven't heard from you by then, I won't be able to have seats or food for you if you do come."
I think @huskypuppy14's response is perfect for this so you don't have to stress about this kind of situation. It covers all of your bases and takes the load off of you. You should be calling those who don't RSVP anyway just in case they actually didn't receive an invite or completely forgot or something. So if these family members respond with something like "2 or 3 people . . . maybe" just say "I need a hard number by such and such date and if I don't get anything you will not have a seat saved for you."