My step sister's mom dated my step dad's father once. The whole family was creeped out by it. They're bother literally crazy too. Hopefully "your" child really is yours!

Oh my god... No self respect. Sorry dude?? hope you find someone that actually cares and loves you very heap much.

So your child is now your sibling. At least the kid will still be in your life

That sucks and all, but POOR KID. Imagine when he grows up. He will know he has a ruined parenthood

Wow. My sympathies, OP. What a lousy Christmas surprise.

Fyl, that's worse than Game of Thrones

Oh God, shady914 hit the nail on the head. I wish I could say I didn't believe this sickening story, but I once worked with a woman whose narcissist ex-husband did the same thing to her son, minus the pregnancy...so I know it happens. There are no words to fully express how completely heartless and depraved your father and ex-fiance both are for what they have done to you. A betrayal on that level takes an utter and pathological lack of humanity on both of their parts, and it's heartbreaking what this implies for your life and the child's life moving forward. Honestly, this FML scares me. I'm currently single, but I'll need to choose my future fiance/wife wisely, because this is exactly the kind of thing my own estranged dad would try, on purpose. I'm basically counting on it.

Holy shit

Have fun raising your sibling I guess D: That's awful!

Wow... I'm actually very interested in how they would figure out that paternity test since the dna would be soooo close. Obviously with that kind of baggage it would be a bitch to be raising the child together if it turns out op is the father after all. And talk about a family wrecker ... that lady must be very special indeed. Not only did she ruin their relationship, but also the dads marriage and potentially the entire family's trust base. I imagine if op has siblings they'd also never want to trust dad again after that one...