That is a true statement. It is a matter of trust. One would always trust a family member unless in a few cases where someone outside the family is trusted more.
But one disadvantage people face is that some of the family members maybe the one you trust may not be interested in bitcoin and cryptocurrency. So even when they have the keys, they still need the help of someone to be able to get the monies of the wallets.
That is why I recommend that you teach a trusted someone about bitcoin before sharing the keys.
A wise and appropriate way to provide education in advance to several trusted family members. If they already know and understand what bitcoin is and know how to use it, we won't worry anymore. They can manage our wallet well when we can't use it anymore.
But you also need to remember, Tell them about the risks that will occur in bitcoin or crypto, because I'm afraid they will panic at the price fluctuations that occur.