<human>: Basically my dad had an affair when I was still a foetus and it spanned on for a year or 2 and resulted in 2 children who are 1&2 years younger than me. I only found out about these children in October after he married the mother of his children. 

I'll make it clear that my father only divorced my mother April 2015, and before this I had no idea of any affair, or secret children. My parents were married for 19 years. For 15 years of this marriage my dad "worked away" in London [I live about 3 hours north of London] to earn money for us as he couldn't get plumbing work around here. My suspicion is that he moved in with the woman he had an affair with, and his kids. 

Since this came out I've changed my surname from his, to my mothers [F48] maiden name. 

So my dad has never been horrible to me. He's never yelled at me, never said anything nasty to me, never punished me for anything. But, he constantly lies to me, hid secrets from me my whole life, and hurt my mum and sister [F20] in ways I can never forgive. 

One thing he does say to me face though is really horrible. He says nasty things about my mother, making her out to be this demonic person, when really she's super sweet. 

He also can be mean about my sister, he was pissed off that she didn't get him anything for Father's Day this year and when I asked him if he deserved it his words were "it's a Father's Day to celebrate, I deserve presents". 

He constantly tells me how much he's sacrificed for me, how much he does for me and that he's always been there for me... Is this manipulative?

Thinking about his children makes me really upset. I've met them, and they're quite nice, but I don't think I can have a relationship with them. I have a sister, and I don't believe that anyone can match up to her.

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<bot>: Basically... How do I politely call my dad out on his bullshit, stand my ground when he tries to convince me he's not lying, and get him to admit the truth?