
Okay here is the spoiler for you all.........................................
So basically in the mc's first life time by the time the duke managed to locate her and find his daughter she had died so using his sword ( If I remember right from another comment post) he reversed time. Σ(っ°Д °;)っ
But doing went along with a cost and that was his most treasured memories and when I say he forgot I meant he forgot EVERYTHING in regards to his wife and the fact he had a kid.(〜 ̄△ ̄)〜 (/TДT)/

I mean the price is the price and to see his child again alive and well, will have all been worth it. So from here on out any misunderstanding that leads to the slander of the father will now be responded to with violencebecause all of them deserved better. It's weird though that there is no kind of information and that it's been covered up like this...I wonder who covered it up. Or did the magi also shift time to make things more difficult for them to connect?

To answer your first question: I am not to sure about the details as I am only repeating something I read in a spoiler post so I am guessing it also effected the people who worked around him such as the Duke's knights, ext. (▰˘◡˘▰)
But on the other hand (in answer to your other question) considering how MANIPULATIVE ヽ(`Д´)ノ the King and certain people were in regards to him reclaiming his DUAUGHTER (ง ° ʖ °)งit wouldn't surprise me if they did keep their relationships under wraps in the mc's first lifetime.( ̄∇ ̄")
If her mother is really Roana and that tiny memory of Roana that the Duke have means that they indeed had a relationship, then why can't he remember her?