Unbiological Sister
What is an older sister? 3
A sister has nothing to do with you.
Sisters' parents are not the same. Can be adopted. Sometimes people say that having a father like that doesn't make sense to a brother-in-law, but in principle it still makes sense.
A sister has nothing to do with you. You don't belong to his father, because you don't have a father, including stepbrothers.
A foster sister She is not a step-sister because her mother is also her mother.
A sister who was not physically chosen by her parents. He is not a blood relative.
