1. great-grandmother = the mother of your grandmother
2. great-grandfather = the father of your grandfather
3. step-father = the husband of your mother
4. step-mother = the wife of your father
5. step-sister = the daughter of your step-mother or step-father
6. step-brother = the son of your step-mother or step-father
7. half-sister = the daughter of one of your parents
8. half-brother = the son of one of your parents