Bitcoin and digital heirs in your family

Dears,

this is something I have been thinking laterly. I have been able to invest some 0.3 BTC (and counting), I am in my mid 50s, healthy life but I always think of my family and children.

We all know we will die eventually, and we also know (even if it is a scary thought) that we might have a sudden death at any moment. My honest question to you is: how do you make sure your heirs will have access to your BTC investment, should something bad happen to you?