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your 'step' brother is actually your half brother. step siblings would be children that are not blood related to you. your mother's husband would be your step father. children that he fathered without your mom would be your step siblings. your half brother's half siblings are not related to you.
actually that would make him your half brother step is if like you dad marries a women and she has kids from someone else
no cause they have to have the same mom or dad or they have to be married to either your mom or dad
Answer this Question: "Am I their stepsister?"

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Am I their stepsister?
ok I have one step brother his mom is my mom but his dad isn't my dad he has a lot of step brothers and sisters from his dads side does that make me there step sister.