Sir. B. : I said the 4th verse is the hardest, and, indeed, the first stage of the puzzle of its first two lines doesn't tell you the answer. Once you've worked out what the first stage is, then the second stage leads you to an idea that then can be discerned as the name of the answer.

Mercen-X : The tree is not a family tree, rather a real tree. It is not the heir. The watchman is more easily identifiable, but still obscure.