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My dad and his second wife have two kids, my little brothers and they are 7 and 9 so youngest being 23 years younger than me. it took time to get used to but I dont think of them as half siblings at al. The youngest is best friends with my 5 year old. thick as thieves.
my dad wasnt the best in some ways to us and he is much better with the two youngest now

Life has a way of working its self out

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My Dad's girlfriend's are always young and that didn't bother me until he had one who was 10 years younger than me. For some reason that seems wrong to me. His current girlfriend/partner is two years older than me and they seem perfect together.

If she is screaming down the phone at you when you are talking to him then the chances are you wont have much access to your sibling. Siblings are funny things really when you don't grow up with them the relationship with them is very different and hard to define even without bad feelings towards step parents.

Best of luck with it all. You never know this could be a way of putting the past behind you and making friends with her.

I don't believe the op said there was anything wrong with the age gap between her father and his wife.
I'd feel weird if my father remarried and didn't tell me and then started a family 27/28 years on from family one. I think it's entirely reasonable for the op would feel unsettled and strange about this news.
When the new baby arrives as others have said it'll be a new little life to enjoy, but don't deny how you're feeling right now- they're valid thoughts and concerns given how your father reacted to your own pregnancy.
C
Xxx

Imagine the wife was a mm!