<human>: We haven't sent out save the dates let alone invitations.  The nagging issue is the guest list.

* Extremely conservative relative that traps you in a corner and talks to you all night about how the government sucks and how to cheat it? No problem
* Uncle that loves to spin stories that aren't true and you must keep away from the mic during speeches? No problem
* Friends bringing their special kid despite the fact that you told them not to? No problem

* Two friends who are going through a really messy break up and possible legal fight over their one child? PROBLEM

Two solutions up to this point would have been to invite only Friend A, suffer the consequences of Friend Z's wrath socially.  A friend who invited them both (when they were more civil post break-up) advised to invite the two.  The reasoning was that they were grown ups and they can handle themselves. This was not a problem until Friend Z declares that they will start legal proceedings for custody of their child, and Friend A has to respond in a legal fashion as well.  Friend Z has narcissistic tendencies and never treated A very well in the last couple of years of their relationship.

I'm close to A so they proceed to give me their side of the story.  The sad part is that Z hasn't come forward to tell their story, and they pretty much lambast A on their FB.  It's rather petty because I want to give Z a chance.  Their actions and their attitude towards A makes it really frustrating for me to want to invite Z.  I'm not sure if the acting civil part is going to happen anymore.

The option was to just invite A and not bother with Z, but now Z is staying with friends who I am inviting (they are also helping with the wedding, so Z will know when and where the wedding will be.)

Could you distill the essence of the text into 1-3 sentences?
<bot>: Two unmarried Friends have a child, then have a messy break up, Z threatens to take legal action for custody of their kid, A has to legal up too.  Who the hell do I invite to the wedding?