For me the problem with password managers, etc. is that it assumes that there will be a somehow tech savvy partner or relative left behind with all the knowledg

For me the problem with password managers, etc. is that it assumes that there will be a somehow tech savvy partner or relative left behind with all the knowledge of how to open it. I prefer a method that can work in case me and my partner pass at the same time (e.g. accident). A paper will work for my partner, parents, siblings or an attorney in case of emergency.