What is the relationship like between Macbeth and Banquo & what happens between them in the future?

Macbeth and Banquo were friends at the beginning of the story. But when they are both together one day, the 3 evil witches come and tell them their prophesy. They tell Macbeth he will be king and they tell Banquo he will be the father of a series of Kings. Upon hearing this, Macbeth becomes anxious for his prophesy to come true. So, he decides to kill the current King of Scotland, Duncan. Macbeth then takes over the throne. But suddenly, Macbeth starts to worry that Banquo's son or Banquo will take over his throne. Macbeth decides to hire 3 murderers to kill Banquo and his son. The murderers kill Banquo, but his son escapes. Later on in the book the character named Macduff kills Macbeth and Malcolm, son of Duncan, becomes King. You could ume that in the future Banquo's son will become King and Banquo's prophesy come true.