If your daughter is married to the son-in-law then no, you should not be insulted. However, if it's your daughter's sister that is invited then yes, you should feel left out.
Being selfish is not against the law. All laws of the UK and the USA can be seen at the links in the Related Links area below.
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
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."
what is the plural form of daughter in law?
ex-daughter-in-law
The plural of daughter-in-law is daughters-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.
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.