Justin With Different Parents

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So I'm re-reading The Wedding Present by Predec2 and I'm really craving something where Justin finds out that he's the one with a different parent. Preferably, he finds out that Craig is not his real father. I know there's one somewhere where Carl finds out he's Justin's real dad?? Or maybe I'm imagining that. It could be an OC we know nothing about...

Let me know if you've got some suggestions! Thanks a bunch!

EDIT: Found the one where Carl is Justin's real dad. Still would love any more suggestions though!