My mother passed away in 2019. I had to file for 2018 as usual, and then in 2019 I filed for her estate (the year she passed away). She only had social security and a bit of interest from a bank account. So if the 90 year old has filed each year, family would need to continue and file for the year he/she was living, then for the year he/she passed away as the estate of ....
