Geralt & Ciri never had a father-daughter relationship in a 'traditional' meaning of the word. Geralt never really raised her (it was rather Yennefer, if only for a few months). But it doesn't mean that Geralt doesn't have a parental feelings towards her and vice versa. She's his child of destiny and her growing up changes nothing.
Yes, their interactions are 'liberal' but that's how a lot of children interact with their parents nowadays. It certainly doesn't mean that Ciri doesn't have respect for Geralt or that she's not thankful.
I'm glad that I give you all occasion to support each other, make fun jokes of Uma e t.c.
But your comrade by himself agreed with me by this post:
This is facts:
1. Geralt and Siri never had traditional father-daughter relationships, they do not share blood or genes, there is only mystical "destiny" - i.e. words, written in dialog, in which Geralt talk about Siri with another people.
2. As you might know, in IRL or video conversation people receive only 25% of information in verbal form, and other 75% are visuals, voice intonation, face expression and so on. I of course made a quest with that "ornitologist" sorceress, saved godling and receive a positive emotions from that, but I really don't remember any text from that conversation, I am in new big city, I am making quests with Triss which I know from mods to Skyrim, there is so much excitement, why I must care about that memories of past? Maybe after third playthrough I will remember every conversation, but in first one, this text is just hollow in comparison to all which happens in Novigrad. So this is where developers missed the point. They ought to made some interlude mission with Siri like a small girl, and Geralt adopting her and so on - but no - only text in 150+ hours video game.
3. Skjall and sauna - this is simply ridiculous - even if you don't care about Siri to that moment and your thoughts was with Yen or Triss, after sauna, all that teasing talk by Skjall's sister and last kiss, you will want her (if you are prepared by books, then you will close eyes and repeatedly press "skip" button to skip this "shame". I actually wear Siri in towel because I think all this nudity in games is stupid, but even in towel she was same beautiful and clear girl). Why developers put this part if they want player to perceive her like a daughter?? If they want her to be a daughter they will leave her as she was in prologue - a girl, and not a woman. But they purposely made her bright and cute - to catch player's attention.
4. Also nobody told me why she behaves to Vesemir with proper respect, like to a father (or grandfather) and in the same time to a Geralt like a best friend.