Welcome David.
Best wishes to you, your two sisters and the rest of your family.
Like many others here, I corresponded with your Dad. Dave Sr contacted me in response to an Items Wanted post I made about four years ago. He was a friendly and generous man. We were in contact a few times after. He was exceptionally supportive of some personal issues I had at the time.
He donated lots of useful stuff for my cheapo home building projects. He would not accept my offer to cover postage costs nor take anything for the items he posted to me. At one point he offered me an unwanted iPad for free! I declined as I felt he had already been more than generous to me. From what he said, I gathered that someone else would benefit from the offer. I was surprised to hear of his passing and a little mournful.
I'm glad to see you posting in Basschat. It is comforting to see that you are seeking good advice in dealing with your late father's belongings.
Good luck with your clearance.