Simple English definitions for legal terms
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A stepbrother is a boy who becomes your brother because one of your parents marries someone who already has a son. He is not related to you by blood, but he is still considered your brother because you are now part of the same family.
A stepbrother is a male who is the son of one's stepparent. This means that they are not biologically related to you, but they are part of your family because of a marriage or partnership between one of your parents and their parent.
These examples illustrate how stepbrothers are related through a marriage or partnership between their parents. They may not have grown up together or have a close relationship, but they are still considered family.