I made it to the farm area in Crookback Bog and the Grandmother is inside the house watching the kid. I have agreed to play hide n' seek with the children in exchange for a distraction. Using the witcher sense, I have been able to locate 3 of the children. I have tried following the final set of steps that go up a small ladder onto the roof, but I cant get up there. The door to this building is also locked. I have looked around for the key to open up the door, but I can't find that either. How do I find the last orphan child hidden in crookback bog?
I know the one, he was a hard one to find due to the camera angle. I actually found him a few times and didn't see him even though he was sitting at my feet. If you are looking at the ladder then you will need to walk around to the other side of this small roof part. You are not able to climb up the latter. The child has climbed up and just jumped down the other side. He is hiding behind a large bale of hay / straw. Even when you are standing there, he might still be hard to see, but interact anyway and it should be enough to mark him as found.