I just create this website and would like to know if you will use or not, and why. please advise, thank you. [https://heirlooms.app/]
Overall, this is not a tech problem. You are trying to use a web site to replace a communication gap with your family.
As a tech person, I would probably create encrypted file on my family cloud drive with instructions, to be sure that I own the data and I know what happened there. On another hand, it requires some efforts (and also instructions for the family how it can be decrypted - the hardest part :D )
Outside this i have encrypted drives and shared passwords on this
Also review wills and power of attorney every few years