Assuming Scotland remains in the United Kingdom, and assuming he chose to be called King William (he doesn't have to), he would be called William V everywhere (because the last William was William IV). Even though there have only been three previous kings called William in Scotland, the highest number will be used (according to an arrangement suggested by Churchill in 1953.)
If you're talking about the line of succession, then if Prince William became king, but died without fathering an heir, then his brother Harry is the next in line for the throne.
Prince William, who is now the Duke of Cambridge.
Prince Charles is next in line. Behind him is his eldest son Prince William. If Prince William ever has children, his eldest would be next in line. If Prince William never has children, then his brother Prince Harry would be next in line.
After Her Majesty Queen Elizabeth passes, the Prince of Wales, Prince Charles, will become King.After Prince Charles passes, Prince William will become King, as he is next in line. In the event that Prince William were to die, his brother Prince Harry would take the throne. This is because Prince William currently does not have any children, hence the throne passes to his closest relative, his brother.
If Prince William were to die, his eldest son, Prince George, would become the next in line to the British throne.
Prince George (born July 22, 2013) is third in line. As of 2016, the line is through Prince Charles (oldest son) to Prince William (oldest son) to Prince William's children (George and Charlotte). They would be followed by Prince Harry (William's younger brother), then Prince Andrew, Duke of York (younger brother of Charles) and Andrew's daughters Princess Beatrice and Princess Eugenie.
Prince William will be succeeded by his eldest child, Price George. The line to the throne is as follows: 1. Prince Charles 2. Prince William 3. Prince George 4. Princess Charlotte 5. Prince Harry 6. etc etc
The next in line to the British throne after Prince William is his brother, Prince Henry. See the related question below.
Currently, the next royal in line of succession is Queen Elizabeth's second oldest son, Prince Andrew, the Duke of York.
Yes.
in Prince William county it would be a "B"
She would abdicate in favour of Prince Charles becoming king. If Prince Charles refused, then the roll would become the responsibility of Prince William.