<human>: Can you succinctly summarize the text in 1-3 sentences?

Long story short, my father cheated on his wife with my mother causing her to become pregnant with me.  His wife stays with him after finding out and they later have two children, my half-siblings.  

Until I left for college, I saw my father consistently at least once a month and spend time with him when I can now, although that's not terribly often.  I always knew I had half-siblings because he spoke about them openly with me, gave me updates on their life, hobbies, school, etc.  He's recently been wanting to change his life and improve our relationship.  I am perfectly happy to accommodate him, though I have never been unhappy with it.

Well, he's recently started talking about wanting me to meet his two kids.  Now, I had always assumed they knew about me, since I knew so much about them.  NOPE.  Apparently my dad and his wife never speak about me in front of them.  Now, I never had a huge desire to meet them, but I don't object to it either.  It's just now it feels like it will be super awkward instead of the slightly awkward it was already likely to be.  I can't even imagine what they'll think about it.

I don't feel upset, just confused and really weirded out.  I don't know what to think really.  I'm almost more mad for them than for me, since at least I knew they existed.  I'm an only child, I don't know anything about sibling relationships.

If you found out you had a half-sibling you've never met, but your father spent time with your whole life, how would you feel?  Would you want to meet them?
<bot>: Found out my dad never told my younger half-siblings I exist.  Worried they will/won't want to meet me.  Not really sure what to think at all.