The DUI charge may make a difference if it was within the past 3 years or so. However, you need to find out if the marijuana charge was a misdemeanor or felony and the exact date it happened. Some employers will overlook a misdemeanor if it happened several years ago without a recurrence. You may also check into your state's expungment rules.
However, just from these two events, he may not be an ideal candidate to be handling inventory and administering drugs.
If he meets the qualifications for it, he can petition to have the Marijuana charge epxunged from his criminal record. The DUI charge is another matter however, that is a record on your DMV files and motor vehicle records are not normally subject to expungement.
He isn't related to you, not by blood anyway
Your nephew's nephew is the son of one of your nephew's brothers or sisters. He is your great nephew.
Your mother's (mom) nephew is your answer.
Your nephew's son is your grand nephew or great nephew.
Your nephew's son is your great nephew. Your niece's son is also your great nephew.
Your wife's nephew is your nephew and his son is your wife's, and your, great nephew.
The male counterpart of a niece is a nephew.
Roy Disney, which is Walt Disney's nephew. Walt Disney made Disneyland possibly for everyone.
Niece would be an opposite as a niece is female and a nephew is male.
Your nephew's son is your great nephew.
Your nephew's son is your great nephew.