This thing about trust I don't know how you guys look at it, especially when it comes to family, marriage, children, and all that. Before you move ahead and get married to a man or woman, there are things that you use to judge them before making your decision, and if you don't trust them at all, there is no way you are going to start a family with the person.
So, to cut the whole story short, if you are married for security reasons, your spouse should at least be aware of some of your holdings destinations in case of emergency.
Currently, almost all my wallet's details I don't hide from one of my trusted family members; he doesn't have access to them currently, but if an emergency arises someday, he knows the way about my holdings, and with little support from others, they could be able to access them, so my holdings are secured to some extent.
People take trust issues too extreme but the truth is that you've no choice but to have someone to put your trust in and confide in him or her for this reason of sudden death to be sure you have your family to benefit from your investment in the case of emergency that takes your life or a brain damage. When we choose who to marry we also unconsciously and consciously have taken a decision of sharing certain vital secretive informations with that person we call spouse, what I see as to why many people are scared of leaking such vital information as private keys to spouse is due to how prevalent the divorce cases has been on the surge nowadays and it has become a lesson for them in the aftermath of what resulted in such divorce cases. But still, we ought to have someone to trust with informations because life events such as death is unpredictable and inevitable.