I still am of the opinion that he should at least have that one person he trust in the family that he would give the seed phrase or keys too. The issue of waiting till you are unwell before declaring some of this things is risky, sometimes death doesn’t comes with any sickness so with the scare he got the first time, now is the perfect time to him to correct those mistakes and make someone aware of his phrase, he can simply set a time lock to that wallet so that even if he reveals his seeds now they won’t be able to spend it and if he lives to pass the time lock date or later have a family of his own and a new kin then he can move this to another Wallet and give the new keys to the kin
Like if I am in your shoes, I will have a family lawyer that will stand for the family and I will set the will and my Bitcoin walllet with a time lock, but if I am still alive and the time lock dues I might still extend it, 2× of the previous one, so if you are no longer alive your lawyer can read the will to your children and families to everyone hearing.
I have seen a situation like this before, but in this case, a man got married to 2 wives and he shared all his property with all his children while he was still alive and everyone went their own ways, but after then, the friends of the man were asking him why he shared his properties to his children while he is still alive and that was the topic of discussions that day.