Business & farm

Do I even actually have to file either of these forms? When it comes to my father's affairs, I'm it. There isn't anyone else to deal with them, until my own executors are filing my last forms.  I can't foresee anything cropping up, in the future, and I do still want any and all of his IRS mail coming to my address. Officially terminating the fiduciary relationship would seem to end all of that