I've read a little about it, but want to understand it completely, because I'm very interested in the royal houses of England. What happened with house York and Tudor? And what is the Duke of York today? Thanks for answering!
Hello!
Basically it goes like this - Henry Tudor was the last (male) descendant of the House of Lancaster, which had been wiped out by the Wars of the Roses. He married Elizabeth of York, the oldest daughter of Edward IV and Elizabeth Woodville. Her brothers were the Princes in the Tower ostensibly killed by Richard III (Richard was Edward IV's younger brother).
They married and sired the Tudor dynasty; Elizabeth I, the last of the Tudors didn't have any kids, so the succession reverted to the descendants of Henry VII's oldest daughter, Margaret. James I & VI was Margaret's grandson, iirc (I might be missing a generation).
The duke of York is the title traditional given to the younger son of the monarch. So the eldest son (today, prince Charles) is the Prince of Wales, while the next son (today, prince Andrew), is the Duke of York.