Although it's a weird question, I'll have to tell everything to my best friend. He will be the only one, knowing everything about my money and stuff like that. In my testament, I will have to leave details about what he is going to know and do to have my btc. It's very odd to write these things because am still alive :p
Really weird indeed but it is happening there is possibility that it will happen to us also. I will do the same, that is to make a manual or instruction how to recover my btc with my seeds. I will give to my closed family members or to a trusted.