Ask HN: Secure estate planning

I've been going through the process of setting up a will and related documents. The people to whom I am entrusting my children (and thus also my property) in the event of my death are not exactly cybersecurity experts, so I need to maintain a simple way for them to access my accounts without me. I'm thinking about the privacy implications of this. So far the best thing I've come up with is to lock my password manager master password with some basic instructions in a safe that they know how to find and open. I'm okay with trusting them, since I'm trusting them with my children, but I'm still slightly concerned about the privacy risks and their ability to figure out how to access everything through my password manager without my help present.

Does anyone here have better ideas?