Long story short:
Parents are paying for part of wedding, probably 40% to our 60%
-Had been asking parents for list of people to invite since 1/1
-Gave a deadline for invitees from parents for Mid June.
-Save The Dates went out in July (requires travel for many guests)
-Parents invited 4 more people, after deadline
-Invites went out 9/16 to max number that venue can handle (including the 4 extra-making us cut 4 others- we did not over invite)
-RSVPs have come back & so far all are "Yes".
-Heard over the phone last night (9/23) when on the phone from Dad yelling from other room "Tell her we'll let her know other people we'd like to invite!"...my immediate response to my mom was "we can't send any more out! we'd be over capacity!" my mom repeated it to my Dad.
Now I'm feeling A) like a JA for having that knee-jerk response

like we should try to make this work...I mean, 100% of our invited guests aren't going to be able to come...right? Who has a 100% RSVP rate...?
Should I over-invite(which would include reaching out to the previously cut 4) & is that "b" listing?
Should I stand firm because I gave them ample opportunity to invite folks?
What is your advice?