Estate Taxes - Income question

I am working on an estate tax return for my aunt. I am the administrator as well as the sole survivor. Income I have received is the monies that were in her checking account and savings account, as well as life insurance. I know life insurance is not taxable, but the checks were written out to the estate, not me. Does that change things then? Would I have to claim that amount for the estate?

 

Also, what all income/monies can be included for the estate?

 

Thank you in advance!