I had one of my wife's family take their life with hunting rifle they had. For now I am in possession of it until their kid says they want it or that I can have it. It's beautiful firearm that was made when the company still made good guns.
One thing of note, I wouldn't share with a buyer or advertise that it is a suicide gun, there are people out there that want a gun with a body on it and will pay good money on it.
As for my situation, if I get to keep it I'm debating on keeping it stock or turn it into a tactical type rifle. My deepest condolences on your father. My dad died in my arms of cancer and that was tough enough. Having seen what happens to a family after a loss like yours, It's just a terrible situation. Peace on you and yours!