Family..

Can you do two "family" tables of FH's family? One with mom's family and one with dad's?

Family dynamics can be so tricky but I agree with Becky, I would do a sweet heart table for you and your partner , a table with the bridal party and their dates, and then family tables. Fingers crossed everyone can be civil for your special day

^^ What they said lol. Unless you're planning to have one long table where everyone sits at for the reception, I'd just have a table for mom, mom's boyfriend, mom's parents, and any other of her close relatives to fill that table, then a similar setup for his dad. During the ceremony they'll be busy watching what's going on and won't need to interact, so if you're doing a bride's side and groom's side, you could probably sit them in the same row without issue.

My FH's parents are in the middle of a divorce currently. It's been messy and stressful. We're having a sweetheart table, so our plan is to put them with their respective families. Neither of ours gets a plus one but that's due to our circumstances with it being so fresh and raw. We're also sitting down with them together, so that they're around each other before hand and we're laying out our expectations from them and our hopes for the day. Maybe you can have both sides over for dinner. It doesn't have to be sneaky, say you want to just have everyone over as a pre-wedding get to know each other dinner to avoid any awkwardness day of and that solves the issue of them meeting day of your wedding

Hopefully this is one of those things we stress about and look back on later like why was I so worried about that. If you think it ll help you can talk to both sets of parents acknowledge that it may be awkward but you are hoping it can remain pleasant among everyone and then ask who they'd like at their table. It is often easier if there are no surprises, meaning they know each parent will have a date they know where they will be sitting and with who etc, they know if and when they are expected to interact. In the end everyone is an adult if something negative happens (hopefully it won't) thats on them, unfortunately we have no control over other people's behaviors just our own reactions to it. You are going to have the best day!!

My parents hate each other. I sat them on opposite ends of the room with their own family/ acquaintances so they wouldn't feel obligated to mingle. We had a pretty small wedding so doing something like that would probably work in a bigger venue as well. If they must interact, I'm sure they can act like adults and focus on the fact that it's your day. Mine were able to pretty well until my grandma got drunk and tried to pick a fight with my dad (mind you, this was a dry wedding she brought in her own scotch). My mom politely steered her towards the door.

I'd recommend as others have: Seat them well apart from each other, and maybe have a pre-emptive conversation about keeping the drama out of the evening. With that, they should be able to be adults and be cordial. My fiance's parents are also not on good terms, and my bigger concern is the ceremony. They all have to sit in the front row, so we're planning on seating siblings and maybe others between them. Any kind of buffer. They're not the kind to yell or make a scene, but at the same time, we don't want the night to be dramatic. Best of luck with your situation!