Is it weird to marry your step brother?
Your step sister by definition is one who is not related by blood to you. You are only related thru the marriage of your seperate parents. Therefore there is no legal, moral or ethical reason for you to marry. It is not incest, that would require her to be your half sister
Do people marry their step siblings?
Marriage between two people who are closely related by blood is likewise illegal, but step-siblings aren't blood relatives. Legally, they are considered related only because their parents got married. In all but one state, step-siblings are legally free to get married.
Can you marry your brother or sister?
It is still illegal to marry your half or full sibling in all fifty states of the US, because some people like to control the lives of others. There is no good reason to deny any consenting adults their right to marry, and eventually, our laws will catch up with that.