Yeah, this was a popular fan theory after the episode first aired. It's an interesting theory and puts an even darker spin on things if true.
Personally I don't think it was what the show creators where intending for us to take from this episode. If it were I think they'd have made it much clearer and more obvious.
Whilst the children look similar I don't think they could with 100% certainty said to be the same and even if they were it could be a case of prop photos being used for filming that had the same children in them - they wouldn't have expected the fans to look at them so closely.
Do we see an image of Hope's wife? I can't remember that. It has been a while since I watched the episode though.