I can see why people would think Shade or Radomus is Anna and Noel's father, but I'm not 100% convinced because I can't wrap my mind around why they'd have Anna and Noel go to the orphanage to spend their time getting electrocuted. You could say "Maybe they didn't know what Sigmund was doing" but Radomus seems like the kind of person who would investigate something like that before sending them there, and Shade definitely knew what was going on since if you see his interview on TV he says to deliver Anna from the "flat-lined creep". Which I still wonder why he couldn't do himself. If he can materialize on walls and float in the air, I see no reason why he couldn't get the kids out.