If i recall... after the two islands are done the idea was for the main plot to take Claire to the mainland to establish a foothold, then head to the remaining two islands to gather more allies and make the push into monster territory.
We're not there yet though (obviously) but considering the dev's other game, Overgrown: Genesis, had something like five different epilogues there's a good chance your end result would depend on the friends you made along the way.
As for her dad... Not sure. Since Claire's out looking for him i think he's too important for the plot to have already been killed, so my guess is either imprisoned or corrupted. Probably the latter so Claire needs to face him at some point in a boss battle, with a stat check to see if she succeeds in saving him. But again, that's guesswork on my behalf.
![[_Lothric_]](/data/avatars/m/686/686268.jpg?1691048504){kind=avatar}