You can stick to all the technical solution to it, but my two cents, is go ask you, now do you trust your wife or child(ren) right now and if by chance death call you now do you think they deserved it for real and not because they are for family? If so you can make things less complicated and work with the answers you give now, if you trust your wife or child (ren)  you can let her into some secrets but make sure you trust her, they are many lost bitcoin already due to this uncertainty of unplanned death.