What would royal titles be for children that are later in line for throne?
You always advance a generation if possible. So the son becomes king. A princess is either the daughter of the sovereign, or the grandaughter of a sovereign via a son. Also the wife of a prince takes on the style of her husband. The only exception to these rules is if the king makes someone a princess which he would only do in very special circumstances. For instance George VI was in his 50’s when his grandchildren were born. He knew that he was not going to have a son, and his daughter Elizabeth would one day be queen (barring tragedy). He made the toddlers Charles and Anne into a prince and princess even though they were grandchildren via a daughter. They would have become prince and princess at a very young age anyway, because their grandfather died so young. But he wanted them to have the titles while he was still alive. Your position in the line of succession is not important. When Zara Philips was born she was sixth in line for the throne, but she has no title (not even Lady) bec