I'm so sorry to hear of your friend's illness, you are going to have a really tough time ahead. Emmy1978 suggested a memory box - several years after my OH died I was playing some music cassettes and came across one he had put in the machine, set it on record and left it. It was a fun thing to do, I remember the day well, it was a wet bank holiday, one of my sons had been on a day trip to Bognor, and we were all chatting together. But years later it was such an emotional experience hearing his voice and laughter again. Photos and other mementos are great - but the sound of a loved one's voice is something else altogether.