Uncle George faked his death
At this point I'm not sure why or how, but the main reasoning comes down to two things. One, he didn't die in the novel. Two, the episode after his death sees Atticus look directly at The Count of Monte Cristo standing all on it's own on George's shelf. In the novel a man is presumed dead after his arrest and then returns with a new identity to get revenge on everyone who wronged him. It's possible George and Montrose somehow hatched a plan where George would fake his death in order to further investigate the Braithwhites and the Sons of Adam. Christina and William are actually the same person
Both characters share strikingly similar physical features to the point that they could easily be mistaken for siblings. But most interestingly, the two characters are never show interacting or even in the same screen together. Lending further credence to this is how misogynistic the Order of Ancient Dawn is. She is probably using a spell to become a man so she could achieve lateral movement she couldn't as a woman.- Confirmed.
Titus actually pulled a Grand Theft Me and became William
As William retells the story of the burning of the original lodge, his evil smirk is telling that he knows more about the truth than he's revealing. While it's assumed that Titus died in the fire, no actual mention is made of his death. A mansion worth of burned rubble could easily allow a person with Titus's magic, affluence and connections to fake his own death in the 1800s, with investigators being none the wiser.- Jossed.
George is Atticus's real father
Due to each hint on each episode, it can be an easy conclusion. Hiram's Adaptation Name Change in the series is deliberate.
If you think critically, similar to how Sheriff Hunt attempted to blame the crew for a series of burglaries in Sundown, the blood libel is another example of how white supremacists commit atrocities and blame minorities for them. Hiram could have simply assumed a Jewish last name knowing full well about the correlation of the stereotype and his human experimentation. Considering he's spiteful enough that we only see him as an undead racist, it's likely a final middle finger if he was ever found out. Dee will be the villain in the second season.
She murders Christina in cold blood, and implies she's not finished yet. Also, whites lost ability to do magic, now it belongs to blacks, just like an ability to abuse it too.