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He should have a birth certificate that shows his parents names and one of those would be either your sister or brother depending on how he supposed to be your nephew. Also the birth certificate shows place of birth so if your sister/brother lived in that area at the time it increases the likelihood that it is the correct name.
But if he does not want to deal with you, you can't force him to do so.
What else can I help you with?
Who is your nephew sister?
Your nephew's nephew is the son of one of your nephew's brothers or sisters. He is your great nephew.
What is my nephew's nephew to me?
Your mother's (mom) nephew is your answer.
What is a term for my nephew's son?
Your nephew's son is your grand nephew or great nephew.
What is the term for your nephew's son?
Your nephew's son is your great nephew. Your niece's son is also your great nephew.
What is your wife's nephew's son?
Your wife's nephew is your nephew and his son is your wife's, and your, great nephew.
What is masculine for niece?
The male counterpart of a niece is a nephew.
What is the opposite word for nephew?
Niece would be an opposite as a niece is female and a nephew is male.
What would be your nephew's son to you?
Your nephew's son is your great nephew.
What is your nephew's son in relation to you?
Your nephew's son is your great nephew.
Is your nephew's son your great nephew or nephew once removed?
In English language terms for family relationships, there is no relationship called "nephew once removed." The son of your nephew is your great nephew.
What is the son of your nephew called?
Your nephew's son is your grand nephew or great nephew. Some people say one, some say the other.
What are three sentences for the word nephew?
My nephew cannot hold a job.I have only one nephew. Though my nephew, we are nothing alike.
