Getting rid of stuff that belonged to a passed on loved ones is hard and a process within itself. These things do take time. And you might not want to throw those things away that you cherish the most and bring good memories. But if they bring up bad memories then you might want to start Dealing with them one at a time so you can start to move on,  or have someone else get rid of them while your not around. I found this great arcticle a couple days ago. It might help. 
https://whatsyourgrief.com/sorting-through-belongings/