If their relationship is amiable towards each other, then they should be treated with the respect they would show towards their own mothers.
Your sister-in-law's daughter-in-law is not related to you but the daughter-in-law's daughter is your great niece. You are her great aunt (if you are a woman) or her great uncle (if you are a man).
The possessive form of daughter-in-law is daughter-in-law's.Example: My daughter-in-law's name is Margaret.
Daughter in law is the name given to your son's wife
ex-daughter-in-law
what is the plural form of daughter in law?
Spanish for daughter-in-law: nuera
Your daughter-in-law's sister is not related to you, but is your son's sister-in-law.
To make "daughter-in-law" possessive, you simply add an apostrophe and "s" at the end of the word: daughter-in-law's. For example, "My daughter-in-law's car is parked in the driveway."
If your daughter's brother-in-law is the brother of your son-in-law he is not otherwise related to you.If your daughter's brother-in-law is husband of her sister, then he is your son-in-law.
In English there are no masculine or feminine forms. English uses gender specific nouns for male or female.The gender specific noun for the husband of your daughter is son-in-law.The gender specific noun for the wife of your son is daughter-in-law.
Your brother-in-law's daughter is your niece.
Daughter in law(