Sorry for your loss. Was he using the Online browser version or the Desktop installed program? If he used the Desktop program for 2023 or prior the only copy would be on his computer. Had he started filling out the 2023 return? If not you might not need to log into his account. Just set up a new online account or use the Desktop program and do a new 2023 return for him. Do you have a copy of his 2022 return to see what items you need to have for 2023?
