your not your daughter is by marriage you are not
That's a relation by marriage. Your wife's father is your father-in-law.
in law sister in law father in law mother in law
Father in law
Your father-in-law's son is either your brother-in-law or your husband.
Your brother or brother in law
Technically there is no relationship. When introducing her, you would refer to her as My daughter's mother-in-law.
There is no relation. Your not blood at all so your just really good friends.
The English language has no term describing a relationship between you and your daughter's father-in-law. The two of you are not considered to be related.
The correct plural is fathers-in-law .Fathers is the noun, in law the adjective; fathers in law, not father in laws which implies one father, but with multiple relationships.
I would describe those two as siblings in law. It's not a precise description, but then, not every relationship has a term of its own to precisely describe it.
It Depends. Not every daughter father relationship is the same. There are daughters who hate their father. And their are some who love them because there he onlyones there for them. Everybody's different.
The plural of daughter-in-law is daughters-in-law.