Should I invite estranged family members to my wedding?
Only if you want them there. No etiquette rule obliges you to invite a relative because they are a relative, and no relative gets a vote on it. If you genuinely cannot answer yet, mark the household undecided with a date and a default answer for that date, keep it out of your seat count, and finish the rest of the list — a decision with a deadline is a decision, and an unwritten maybe is not.
Is it wrong not to invite a parent to your wedding?
No. It is a decision a lot of people make and very few talk about, and it does not require anyone's agreement or a reason you are willing to share. What makes it go badly is other people hearing it secondhand, so tell the one or two relatives who would otherwise carry the news yourself, before the invitations go out, and keep it to one sentence you are willing to repeat unchanged.
How do I handle a family member who will cause drama at my wedding?
Decide invite or not on whether you want them there, then handle the risk separately. If you invite them, name the hour you are worried about and the person who steps in — a sibling or a friend who has agreed to it in advance — and remove the flashpoints you control, like the seating and the toasts. If you cannot name the person who steps in, you have not really chosen to invite them.
Should I invite my ex to my wedding, and do I get a say if it is my partner's ex?
Only if you both want them there, and "both" is the operative word — either of you can say no without owing the other a justification, whichever of you the ex belongs to. A name at your own wedding that makes one of you uncomfortable is a veto either of you can use, so have that conversation once, privately, before anyone else hears the name; most of the damage here comes from it being sounded out with friends first and arriving as a position rather than a question. Where an ex sits inside a friend group, decide the one household and leave the group alone: one name coming out does not re-open the layer, and "we're not inviting them, and I'd rather leave it there" is a complete answer to the friend who asks.
Do I have to invite a relative because my parents want them there?
No, but give the pressure somewhere to go. If the relationship is your parent's rather than yours, the seat comes out of their allocation: agree how many seats they have, and let them spend those seats on whoever they like. That converts "how could you not invite my own brother" into arithmetic they can do themselves, which is the only version of that conversation that ends.
Can I keep someone on my guest list without deciding yet?
Yes, and it is the most useful thing this builder does. A household marked undecided is held out of the seat count, stays on the sheet under its household label, and is left out of the downloaded file — so the rest of the list can be counted and sent while that one stays open, and nobody gets messaged before you have decided. Move it into a tier and it appears in the next download.