1. The grandchild of one's stepsibling.
2. The stepgrandchild of one's sibling.
My stepgrandnibling is a good person.
1- Stepsibling's grandchild.
2- Sibling's stepgrandchild.
My stepgrandnibling is a good person.
1- Stepsibling's grandchild.
2- Sibling's stepgrandchild.
stepgrandnibling.
1- Stepgrandnibling's spouse.
2- Spouse's stepgrandnibling.
stepgrandnibling-in-law.