I have a 1041 question.

I am the administrator of my father's estate. Except there is no estate - he had a joint checking account with me, and collected social security and a small pension. No real estate, nothing of value.

I had to open an estate account because he lived in a different state and I had 1 check to cash.  I cashed the check and closed the account. Then I got a notice that I had to fill out Form 1041. It doesn't seem as though this is the correct form. My father had nothing and I already filed inheritance tax in PA.  I can't even see where to enter his social security and pension. Help!