Adventuring with your spouse or children is fun. Seeing them killed by unforeseeably bad odds, or a stupid autoresolve outcome is not. Especially if this destroys your dynasty and you have no way of starting a new one. This encourages you to marry merchants or scholar types and keep them cooped up in a city.

Your sovereign can escape from being killed at the cost of some essence (or whatever it will be with the upcoming changes). Why not allow the same for family members, strictly on an optional basis? When you lose a battle and need to teleport to safety, offer the chance to bring your blood relations along, for double the cost. This way, the royal couple can go questing together without quite as much stress.