Print out those files that contain asset information. Collect all the outstanding bills in one place. Pay those that are for joint tenancy assets. Also note any policies of the survivor that need to have beneficiaries changed. Remember, in general terms, the family is responsible for those decisions that pertain to the health and burial of the deceased.
Most financial matters are the responsibility of the executor.
Pay all necessary taxes and fees. Pay deceased's just debts. Distribute the estate's assets in accordance with the deceased's will or the applicable state and federal laws. File a final accounting with the Probate Court. Sounds simple, doesn't it.