There is never a doubt about the line of succession, it is William, then his 3 children (aged 9, 7, 4). If there are any disasters, making a 9 year old next in

There is never a doubt about the line of succession, it is William, then his 3 children (aged 9, 7, 4). If there are any disasters, making a 9 year old next in line to the throne voluntarily sounds like it.