1098 E. Cannot claim student loan interest because loan is not in my name

trying to add a 1098 E, however because the "borrower" listed is not myself, I chose to select "someone else" while trying to add info; apparently because the loan is not in my name, I cannot claim the interest paid. However the named borrower states they cannot claim the interest because they are not the student. I make all payments toward this loan. Thanks for your help!