THEODORE GLASS/ALEXANDER GILTEN IS PHI'S FATHER

Things to prove this theory:

-They are both evil.

-They both have white hair.

-They are both sadists.

-They are both wolves in sheep's clothing (they can both switch to don't mess with me mode in less than a second).

-They both have empires (Theodore/Alexander's empire is the Snake Pit, Phi's is the Dread Tower).