IMO....the king is up to visitors. With the PM and wife visiting it indicates to the public the King is not considered critical and can have visitation from others that are not family. Also if other visitors are allowed it does not fall onto the family to go several times a day, especially with their current duties. Having DIL and grand daughter visit is fine....there is nothing wrong with that...besides their are probably many medical staff around, especially since he is a King, retired or not. Maybe his grand daughter wanted a special visit.