half-grandniece
Half-sibling's granddaughter.
My half-grandniece is a good girl.
half-great-grandniece
Half-sibling's great-granddaughter.
My half-great-grandniece is a good person.
half-great-great-grandniece
Half-sibling's great-great-granddaughter.
My half-great-great-grandniece is a good person.