"three is a crowd" thought bubble

Update: It seems after a while they stop freaking out about it. I haven't seen a thought bubble in a while. Hopefully that remains the case. I will update again if necessary. 

This is brilliant!!  Love it , what fun gameplay.

You can get this to happen using only those mods? How neat!

You don't have to have a mod. it is doable through regular gameplay. One sim has to live in a town that has the Free Love nap active. So like my sim was already married to her first husband so the most she could be was a romantic partner with the sim I wanted to be married to as well. So one day, her first husband gets a call from the boyfriend saying that he found a ring in her bag and he thinks she is going to propose and should he accept. So I made the first husband say yes you should and that made the wife and boyfriend immediately become engaged and they were able to have a real wedding too. I just had to make sure both husbands agreed to not get jealous by asking them to reconsider romantic boundaries. I didn't figure this out on my own. When I was trying to see if it could be done, I ran across a post somewhere in which someone mentioned the nap thing making it possible. It can take a while for that phone call to happen. You just have to be patient and observant of any phone calls that anyone, even children, in the family get. Someone will eventually get that call about the ring in the bag. The info seemed hard to find so hopefully this helps out others who might be doing large family things too. 

Just an fyi, my sims did stop having that thought bubble for the most part. Would happen on occasion though. Really sucks bc I feel deep down they weren't happy. So I broke it off with the second husband and moved him out and made them just be friends. However, they do have some kind of memory I can tell when they get together for family events. I don't want to have them doing a side thing because then he wants to get married and for her to leave her spouse. I mean if both of the guys agree to not get jealous when she has romantic interactions with each of them, it doesn't seem such a stretch for them to be ok with her being married to both of them. They're all best friends and get along superbly and were a great team raising all the kids. And even though they are all separated and the kids are young adults now, they still dote on each other's kids. I would really like to see more put into their memories, wants, loves and such. It would really add a lot to the game. This game has been around for a long time in all of its evolutions and I can only imagine how much EA could make if they actually worked harder to address ongoing issues and wants. I have been working on a whole family dynasty thing and while I said they dote on all of each other's kids, and have some memory of their past love, they also don't. It's annoying. kk I'm done :)

Just an update, but I actually found that the free love nap is NOT needed for that phone call to happen. Because it happened a few days ago and there was no free love nap active where my sim lived. With that said, the only thing that is needed from my experience to date is for you to have one sim married to another sim and living together. Then have your one sim in a romantic partnership with another sim. for me the "other sim" lived in a different household each time, so I know it works that way. I am also unclear whether the other sim needs to be friends with the spouse of the shared sim. In my game the husband and boyfriend are best friends. So that is an update on that. 

Next update is that I have rocks for brains. I don't know what made me think things would be any different a second time around. 

They are all three the best of friends but, once I marry her to the second sim, it all goes downhill. EA really needs to fix this because why would they give us the ability to have two marriages if everyone is just going to be miserable. Both husbands will keep getting this thought bubble quite often and so far, the relationship almost immediately became strained with the second husband. As of right now I am going to have to back out of my save and redo. Move the husband and wife in with her romantic partner and just keep the boyfriend engaged and see how that goes. It is not ideal, but it will have to do at the moment until if and when EA shows some love for this issue. It is just too much for me to have to rotate the wife between households as I have been doing. These three really are inseparable most always and if one goes out a lot it's almost for sure that the other two will show up on their own and I am tired of keeping them apart. 

Update: So far it seems to be working out fine with her being married to the one and just staying engaged to the other. However, I am really tired of seeing the options to enthuse about upcoming wedding, announce engagement and whatever else when they are talking with other sims. Plus, they will not be able to benefit from the soulmate aspiration because they are not married. Yes, I do use those socials and think they are helpful and really like to see them have the full benefits of being married.