(“It’s all my fault”, Nancy says at one point.)
And the solution is the reverse of the solution in CoE. The young blond male child to whom Nancy has been lying to about their biological relationship has to be saved to save the world. In CoE, Jack murders the child to save the world.
I remember, the first time I watched the Empty Child two-parter, how interesting it is that Jack is so upset about having lost two years of memories in the Doctor Dances, and then in Torchwood is administering Retcon left and right. It’s also interesting in that Jamie’s story is a metaphor for keeping secret from children…if anything slips out, just shut the door, hang up the phone, try to shut it in, don’t let the child know, but this only makes things worse. To make things better, you have to be honest, to tell them the truth. This is interesting in light of how secretive Torchwood is, and how much they hide things.