This is where education comes in... As you engage in Crypto activities, your circle(family,friends) should be aware too.. you should teach them... It is always advicable to backup your seed phrase offline and one way to make it accessible could be writing it down somewhere... If anything happens, your circle are aware that such thing exist and they may be able to look through important documents that you have to find it in case if emergency......
Nobody can really be trusted anyway, if not it you could be able to tell someone about the storage if your seedphraseso they may be of help when something bad happens ..but like I said nobody is really to be trusted as you may be betrayed and lose all your funds
We’re already living in a very selfish world where brothers kill brothers, and sons kill parents, vice versa and it has become a very worrisome and great challenge to trust and I’ve seen stories and incidence where spouse kill their partners over material things and all of these things send fear and high level of distrust to people especially when it has to do with money or asset.
My concern is about the mental state of the person in op story and if the affected person has some good fortune in his wallet, then I think you should suggest a wallet recovery service to help them out so they can atleast attend to the condition of the person firs.
I also agree with @casey15 that, teaching our circle wether friends or family about cryptocurrency will be a great way to fight through some challenges like this and I hope we all get to learn some lessons from all of these happenings.