co-great-grandniece-in-law

Spouse's great-grandnibling's wife.

My co-great-grandniece-in-law is a good person.

step-co-aunt-in-law

Spouse's steppibling's wife.

My step-co-aunt-in-law is a good person.

stepsibling-in-law

1- Stepsibling's spouse.
2- Spouse's stepsibling.

My stepsibling-in-law is a good person.

stepgrandparent-in-law

Spouse's stepgrandparent.

My stepgrandparent-in-law is a good person.

without kinship

1- Collateral relative's spouse's lineal ascendant.
2- Collateral relative's spouse's collateral relative.
3- Lineal descendant's spouse's lineal ascendant (except for the children's parents-in-laws who are the co-parents-in-laws.).
4- Lineal descendant's spouse's collateral relative.
5- Spouse's collateral relative's spouse's lineal ascendant.
6- Spouse's collateral relative's spouse's collateral relative.
7- Collateral relative's spouse's collateral relative's spouse.
8- Spouse's collateral relative's spouse's collateral relative's spouse.
9- Lineal descendant's spouse's collateral relative's spouse.
10- Person in relation to another person who has none consanguinity, none common ancestor, none kinship by affinity, none kinship by indefinite classification, none kinship by adoption and none other kind of kinship.
11- Relative's lover.
12- Relative-in-law's lover.

Collateral relatives's parents-in-law = without kinship.

stepgrandmother

1- Stepparent's mother.
2- Parent's stepmother.

My stepgrandmother is a good person.

sister-in-law

1- Sibling's wife.
2- Spouse's sister.

My sister-in-law is a good person.