Every family is different. My widowed mother-in-law passed in late January of this year and my husband is the Executor. He and his 3 siblings have pretty much gone through everything in the house that they want and have allowed our two daughters to choose things that they wanted. All the family photos will be scanned and kept in digital form with the originals being preserved in acid free containers.
My father and step-mother are currently trying to decide if it’s the right time for them to downsize, especially since she has received an early diagnosis of Alzheimer’s. My father frankly does not want to accept the diagnosis and as a consequence, has already indicated that he doesn’t want to move anywhere because he doesn’t want to have to deal with ‘all the crap’. We’re hoping he changes his mind before things go into a crisis mode with step-mom not being able to help with decisions.
Peach
One of my older relatives developed Alzheimer's, at which point she threw away all the family history from trips to the old country that she had painstakingly researched over many years. So give some thought to what your dad would like to keep, including money (another relative's husband gave most of their money to women he met online as his Alzheimer's got worse) and make some preparations.