The family is ripped when Ciri become Empress, or while running from the hunt travelling through other worlds. She is not going to stay in the nest forever.
Maybe we have to differentiate between "physically ripped" and "emotionally ripped". In my post I meant the latter one much more than the former one. After all, my whole line of reasoning is pretty much focused on the emotional level.
The reality is Ciri doesn't care about who Yen or Geralt is with.
That's not reality. It's just your interpretation and therefore as valid (or possibly wrong) as any other one.
She knows she have them both in her corner always. Their individual happiness is more important to her than their choice of romance. You refuse to acknowledge that because, you think the best and only option is to have them remain mom, dad and little Ciri.
I don't refuse to acknowledge anything (and could we please skip these personal shots, we all just want to share points of views or not?). And you mix up something. Of course is the option to keep the family together the "best" possible action, especially if Geralt indeed loves Yen. For Ciri, there is absolutely no possible negative effect to that. If Geralt decides for Triss there are possible (!) negative effects though. It's debatable how big and influenntial they might be, but it's kind of pointless to deny that it could cause trouble in some way or another.
A possible third option would be that Geralt stays with Yen "just for the family". That could cause trouble as well, naturally. The problem with this option is that it's kind of impossible to make that working in a video game due to the lack of a proper way to display "internal conflict". So the game cannot decide whether the player stays with Yen because he loves her or because he wants to keep the family together. I agree that this perspective would be quite interesting as well but I think it's hardly possible to make that working (well) in a video game...
Well Ciri shows no signs of wanting to be treated like a child or wanting to have mom and dad miserable simply to keep their family dynamics going. Ciri is fully aware of the type of relationship Geralt and Yen had and she knows there's love but, also its not an equal relationship nor a very healthy one. Constant breakups and hooked ups cannot be great for the family as you claim.
I don't compare a happy "Triss+Geralt" relationship to a miserable "Yen+Geralt" relationship. I compare a happy relationship in both cases. In both cases Geralts wants to be with either Triss or Yen. That's the premise (read above why I think the miserable option is interesting but hard to realize) for the possible consequences for Ciri's emotional and mental state.
The point about the stormy relationship is good but I still think it's better than the alternative because even when their relatonship is troubled they still love each other and Ciri knows that. That means a lot to most people. And we shouldn't forget that there are always short-term and long-term effects. I agree that in the long term a break up might have less consequences for Ciri. She will get accustomed to it and accept that it's the best for everyone (even if there is bad blood between Yen and Geralt). Butin the short term and in already troubled times? I don't know, that might give her an emotional blow when she is already weak and vulnerable...
) and explaining how you took your decision.