A child of a parent's sibling; a nephew or niece of a parent; a child of one's uncle or aunt.
A relative who has with the other person only two grandparents or one grandparent (maternal or paternal) in common, but parents are different.
The stepdaughter of one's parent which is not one's half-sister.
The daughter of one's stepparent who is not the daughter of either of one's parents.