Sibling's great-great-grandchild.
My great-great-great-nibling is a good person.
Sibling's great-great-grandchild.
great-great-great-nibling.
1- Stepgrandparent's parent.
2- Grandparent's stepparent.
My step-great-grandparent is a good person.
1- Stepgrandparent's parent.
2- Grandparent's stepparent.
step-great-grandparent.
The wife of one's great-great-grandson.
My great-great-granddaughter-in-law is a good person.