Don't want stepsister as a bridesmaid-am i wrong?

No one can tell you who is and isn't required to be in your bridal party. That's an incredibly personal decision that's up to you and you only. Even if he does get upset, tell him your reasoning behind it, and say you are not changing your mind. And end the discussion there.

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That is true. I know he is going to be somewhat offended though. You're right, just explain the reasoning. He'll have to understand. He knows her and I don't really have any type of relationship. I don't treat her as a sister, and she doesn't treat me like one.

If your dad is upset, just explain it to him as you did for us.

You dont want want to be guilted into putting someone you aren’t close with in your bridal party.

you could always find a small way to include her, but if you aren’t close, don’t do it.

You're under no obligation to choose her. If you guys aren't close she should certainly understand and if your dad gets upset then just explain to him the situation. At the end of the day it's YOUR day and you'll never make everyone happy so you may as well make yourself happy.

Don't choose her out of obligation.

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I completely agree!

I tried to include my stepsister, despite having a similar relationship to what you describe. And she agreed, and then backed out a month before the wedding. So. I say don’t do it. Just gave me a headache.

Let your dad be upset. DO NOT let someone you are not close with be in your wedding party. You will regret it as soon as you ask her to be a part of it.