The next in line to the British throne after Prince William is his brother, Prince Henry.
See the related question below.
If Prince William were to die, his eldest son, Prince George, would become the next in line to the British throne.
When The Queen resignes or dies.
Yes then his children
If Prince Charles dies, Prince Andrew will not become King because Prince Charles has two sons, Princes William and Harry. As Charles is heir to the throne, if he dies, his eldest son William will become heir.
If Prince William is alive after the death of his Grandmother Queen Elizabeth II and his Father Prince Charles he will become King.
It is hoped that sometime in the not-too-distant future Prince William of Wales will have children. In the meantime, Prince William will eventually become king. After he dies, one of his children will succeed him. According to current law, the sovereign's oldest son has the right to become king. If he dies before fathering a child, the throne will pass to his brother, Prince Harry.Who knows? Perhaps one day Prince William will have a daughter, whom he will name Diana after his mother. And perhaps this Diana might one day inherit the throne, and become queen.
Once the Queen (Elizabeth II) dies, Prince Charles will become King, after he dies, Prince William will become King, and Kate, as his wife will become the Queen Consort (not the Queen Regent, like Elizabeth is)
When the queen dies or retires princes charles will have the decision to become king or pass it down to william. And if charles becomes king then if he dies or retires william will be king
If Charles dies before Queen Elizabeth dies, then Prince William will be first in line. If Charles dies while he is king (having succeeded Elizabeth to the throne), then Wlliam becomes king and his eldest son (supposing there is one) will be heir to the throne. If William does not have children, then his younger brother Harry will be first in line.
Once the Queen (Elizabeth II) dies, Prince Charles will become King, after he dies, Prince William will become King, and Kate, as his wife will become the Queen Consort (not the Queen Regent, like Elizabeth is)
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.
Their first born child, boy or girl, will be the reigning monarch. As a matter of fact, whether Kate is dead or alive, she can never be queen (as Elizabeth is now) She will be "called" queen, but cannot assume the throne as she does not come from the royal line of kings. Her kids, on the other hand, are William's children and thus can assume the throne (in birth order)