There is a logical way to determine who the bad guy was: Spoiler The guy who killed the most people. And that's Jackman. How many clones of himself did he kill? Like hundreds??
I'm saying they could have still kept the act going while each choosing to be with the one he loved. It's not like the two women met that often (if at all i can't remember).
Spoiler the daughter doesn't know that there are two Bales. The Bales themselves don't know who her real father is (they shared the one life ... that is, they likely shared wife and mistress too -- almost certainly they shared the wife before the mistress came along as it's pretty clear in one scene that they collaborated in courting the wife). Since they don't know who the father is, then they both loved the daughter as their own. The daughter has no clue that she ever had an uncle.
Spoiler Oh right... for some reason, I assumed the free Bale would take care of her under his disguise.