Will either me or my father receive a tax break if I have paid 2k in interest for a student loan in his name?

The person who has a "legal obligation" to pay the loan, can claim the interest - but only the interest they actually paid. Generally, the parent should be the primary borrower on the loan, and that's whose SSN will be on the 1098-E. However, if you are a co-borrower on the loan, then you DO have a legal obligation to pay it. Therefore, you can claim the interest that you actually paid.