Spouse's half-nibling's spouse.
half-co-nibling-in-law.
The child-in-law of one's spouse's sibling.
My co-nibling-in-law is a good person.
1. The child-in-law of one's half-sibling.
2. The child of one's spouse's half-sibling.
My half-nibling-in-law is a good person.
1- Half-nibling's spouse.
2- Spouse's half-nibling.
half-nibling-in-law.