I lived in NJ for 3.5 months w/ family -- I wasn't earning income and didn't pay rent. Do I need to file a NJ state return?

[KatrinaB]

No, if you didn't have a permanent residence in New Jersey or any New Jersey source of income you are not required to file a nonresident return. 

According to the New Jersey Department of Revenue, if you received income from a New Jersey source while you were a nonresident, and your income from all sources for the entire year was more than the filing threshold amount for your filing status, you must file a New Jersey nonresident return. Please view page 3 in the New Jersey link below for more information.

https://www.state.nj.us/treasury/taxation/pdf/current/1040nri.pdf