Banquo. theyre all related to Banquo in some way.
No. They show him, or have their spirits show him, Banquo's decendants being kings.
A big effect
Oh honey, let me break it down for you. The line of 8 kings in Macbeth refers to the eight kings that Banquo sees in a vision, who are all descendants of Banquo himself. It's a symbolic way of showing that Banquo's lineage will eventually rule Scotland, unlike Macbeth's doomed reign. So, in a nutshell, those 8 kings are basically a mic drop on Macbeth's power-hungry behind.
In the fourth vision, the Witches conjure a procession of eight kings, with the last king holding a mirror that reflects even more kings, symbolizing Banquo's royal descendants. This vision reinforces the prophecy that Banquo's line will be kings, adding to Macbeth's paranoia and fear of losing his throne.
There were eight kings of Scotland who were allegedly decended from Fleance, the last being James VI who happened to be king of England when Shakespeare was writing the play.
The line of kings shown to Macbeth in his vision are intended to imply that Banquo's descendants will not only be kings but will be kings for ever. Naturally this was a polite flattery to King James, who was supposedly one of them. Anyway, Macbeth gets the point, although why it should distress him as much as it does is puzzling.
Macduff
angus is one of the kings thanes
Drugged them.
Macbeth caused it, Lady Macbeth proposed it, the stewards were killed for it, and the king's sons took the blame for it.
Macbeth
MacBeth then Banquo's son Malcom.