Deceased Taxpayer's Final 1040
I am preparing the final 1040 for my mother and am unsure about the reporting of a brokerage firm's Consolidated 1099. My mother died in 2023, and the assets weren't distributed to the heirs' accounts until more than three months later. The brokerage firm included all income (interest, dividends, and sales proceeds) for this three months on her account, even though it was notified she had died a week after she passed. Should I just include these items on her final 1040? Do I need to find a way to segregate the pre-death and post-death amounts so they can be divided between the 1040 and an estate tax return?