nothing relationally

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- 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.
6- Relative's lover.

Sibling's parent-in-law = nothing relationally.

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- 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.
6- Relative's lover.

My pibling's parents-in-law are not related to me, that is, without kinship.

unrelated

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- 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.
6- Relative's lover.

My parent's sibling's parents-in-law are unrelated to me.