My aunt is your father's sister. You are my aunt's nephew. Niece or nephew.

Aunt is your mother's aunt. You are the nephew and grandson of your aunt. Nephew, granddaughter or grandchild.

Grandmother is your mother's aunt. You are the grandnephew of your great aunt. Grandniece or grandniece.

Great aunt is your mother's great aunt. You are the great-great-grandson of your great-great aunt. Nephew, great-granddaughter or nephew, great-grandson male.

Great-aunt is your mother's father's great-aunt. You are the nephew and great-grandson of your great-great-grandmother. Nephew's great-granddaughter or nephew's great-grandson male.