Dio said: But it is still possible that Mantricker IS in the Palace right now - and his parents, too! So the answer to who his sire is can be found right there.
If anyone cares to ask.
I don't think those spirits would actually know if Mantricker had two daddies- because, in the stories, they believe that Lionleaper is the biological daddy. There is actually an entire short story in the BoTC anthology dealing (in part) with Goodtree recognizing Lionleaper and trying to figure out what to do about Acorn. They all come to a nice resolution.
So... if Acorn was the daddy too- it went right over their collective heads. Ergo, if you want to believe that, just choose to do it.