Fringe tried to keep Peter and Olivia apart by introducing Fauxlivia from another world, but absolutely nothing could tear these two apart, not even an alternate version of Olivia. Vulnerable Olivia and stolen Peter met as children and formed a bond that transcended time and space. They literally turned back time to save each other and their family. Can there be a greater love?
Elizabeth: Sometimes what we have is not the world we want, but we have our hearts and our imaginations to make the best of it. I will promise you this: I will be the best mother I possibly can be to you. I'll take care of you, I will protect you and I will never let anyone take you away from me. No one. Not ever. Peter: But you're not her, are you? You're not my real mother. Elizabeth: You were sick. You were very sick for a long, long time and I think it confused you. Yes, I am your mother, of course I am.