I was exactly where you are two or three years ago. My husband had a long terminal illness and we knew for certain. some of these things below you just cannot do if there is any chance for recovery ( like give away everything) Here are some of the things he did:
He gathered up all the home movies and personally had them converted to files on DVDs. Then, periodically we would all sit together and watch the old movies, lots of laughing
I found every shoebox and stash of photos tucked away and got them out and organized. We went through them together for hours at a time.
We went on long vacations with D or just ourselves until he could no longer walk. And many vacations with our really close friends where they could help with mobility and medical issues. We would just rent large vacation rentals in a nice place and spend quality time eating and laughing together. Those are some of my best memories.
He suddenly was more proactive with contacting his friends (and he had a ton of friends). Not about the illness or death, but to keep in touch. Before that he was basically allergic to the phone:) texting and email actually improved his habits.
We made a conscious decision to not do any ‘casual’ socializing at D’s school, neighborhood parties or events. It was too emotionally tough when people rush up and ask “How are you doing?” What do you want me to say? Oh, hunky dory. I would just start crying most of the time.
We socialized a lot with our very close tight group of friends that supported us. Try to find your closest dearest friends and hang out laughing as much as possible.
He made many gifts before he passed away. That was very helpful to me because I didn’t have to try to figure out who might want those sentimental Hawaiian shirts , 20 surfboards or those fancy fishing poles. He knew who they should go to and he just discretely gifted. This was also helpful when I finally had the emotional energy to clear out his stuff. I knew that what was remaining I could make my own decisions to gift, sell or throw away guilt free.
After he passed I found private notes he had written to each of us on his iPad. Thank god I didn’t just erase it. I do not know if he has anything hidden somewhere for the future. I think it would have been nice if he has something for our D on her wedding. I like the idea
I just cannot remember anything else specific that we did to help our D or future grandchildren remember him. My D was very close with her Dad in his last year so I am not worried she will forget anything about him. We just didn’t think about it I guess. We focused a lot on getting financial and legal stuff completely clean.