Do I need to be related to my co-signer? January 21, 2021 15:41 Updated Follow No, we do not require that the co-signer is related to the student. Related articles On my SoFi Private Student Loan, can I have a co-signer who is not a US Citizen? Is a co-signer required on all SoFi Private Student Loans? How do I add a co-signer after submitting my application? Why was my loan application declined due to my credit report? Why was my SoFi Private School Loan application declined?