Filing Taxes with an EIN Number for an Estate Fund

I am the trustee for a fund where the beneficiaries are my niece and nephew.  I have an EIN number for that fund.  Do I need to file a separate return for that EIN number or include it with my return?  I already filed my return; do I need to do an amendment on that return or do a new one?  They both took out all their money and this is the last step to close it all out.  Overall shows all funds were at a loss but there are dividends listed in boxes 1a, 1b, 3, and 5.