That he's murderous, lustful, greedy, tracherous, deceitful, impetuous, malicious
Macduff will not attend the coronation in Macbeth because he is suspicious of Macbeth's ascension to the throne and does not trust him. Additionally, Macbeth has ordered the murder of Macduff's family, further alienating him from the new king.
No, Macbeth killed Macduff's family but not Macduff. Macduff kills Macbeth after telling Macbeth that he wasn't born of a woman; he was born of a C-section or "untimely ripped" from his mother's womb as it says in the play. After Macduff reveals this it appears that Macbeth gives up on fighting because he realizes that it is his destiny to die at the hands of Macduff and then he makes an effort to die an honorable fighting death. Macduff kills and beheads Macbeth off stage, and then he brings Macbeth's head on a pole and presents it to Malcolm the new and rightful king of Scotland.
Macbeth's decision to kill Macduff's family causes Macduff to seek revenge, leading to Macbeth's downfall. If Macbeth had chosen differently and not committed this act of violence, Macduff may not have been as determined to bring about Macbeth's demise, potentially altering the course of events.
Both Malcolm and Macduff believe Macbeth is a tyrant to be overthrown. However, Malcolm is a tyrant himself, if not even more repulsive than Macbeth. Though Macduff is not fully aware of this fact. Malcolm manipulates Macduff into slaying Macbeth and then plea allegiance to himself as the King of Scotland.
If you are referring to Shakespeare's classic Macbeth, it's because Macduff hates Macbeth. Remember, Macbeth turns evil because of hunger for power. Macbeth killed Macduff's wife and children because Macduff knew Macbeth killed Duncan. He wanted to kill Macduff, but Macduff was gone. Macbeth killed Macduff's family because he felt they were in his way and stopping him from achieving his goals.
Malcolm and Macduff now refer to Macbeth as a "tyrant" for his cruel and oppressive rule as king of Scotland.
Lady MacDuff and her children are killed in Act 4 of "Macbeth". Macbeth hires assassins to kill the MacDuff family because he fears MacDuff is plotting against him..
Macbeth Lady Macbeth Banquo Fleance Malcolm Donalbain Macduff Lady Macduff
Macbeth was macduff's host and he was under macduff(in ranking)
MacDuff kills Macbeth.
Macduff enters the battle holding Macbeth's head, triumphant in victory. He declares to all that Macbeth is dead and that the rightful heir, Malcolm, will now be king.
Macduff deliberately did not attend the coronation of Macbeth, as he suspected Macbeth of foul play in becoming king and did not support his rule. Macduff's absence raised suspicion and tension between himself and Macbeth, ultimately leading to conflict and Macduff's involvement in overthrowing Macbeth.