the daughter of your stepmother or stepfather
Stepsister
your sister's husband
brother-in-law
your father's mother
paternal grandmother
someone without brothers or sisters
only child
your brother or sister's daughter
niece
your mother's father
maternal grandfather
the son of your stepmother or stepfather
Stepbrother
your brother's or sister's son
nephew
your mother's mother
maternal grandmother
brothers and sisters
your aunt and uncle's children