I've never been a part of a forum before, this is GREAT!!! Okay, here are my thoughts:
I agree that George and John Christjon are brothers as Philippina's relationship on census states "sister-in-law". YEAH! What I don't know is what happened to George? Have you checked into immigration records? This was going to be my next step.
Also, there are a Jacob and Anna, newly married, living with them...could Jacob belong to George and Philippina or was Mary Katherine Laubach an only child? I was hoping immigration records would give a clue here as well.