He sends murderers to do it.
Lady Macbeth does not convince Macbeth to kill Macduffs family. She convinces him to kill the King at the start of the play, but after that she has no input in the decisions he makes. Macbeth chooses to have Macduffs family killed so that he may seize the Macduff castle for his own. The witches also tell him to 'beware Macduff' when he visits them and so he feels threatened by him. Macbeth doesn't actually personally kill Macduffs family either, he hires the same thugs that he hires to assassinate Banquo and Fleance to murder him.
His wife drugged the bodyguards.
his wife.
Mainly Macbeth, but I suppose his power-hungry wife as well.
Macbeth killed King Duncan after hearing the witches' prophecies and being urged on by his wife, Lady Macbeth
Macbeth sends murderers to kill Macduff's family in an attempt to eliminate any potential threats to his own power. This ruthless act solidifies Macbeth's descent into tyranny and cruelty, as he seeks to maintain his position on the throne at any cost. The murder of Macduff's family ultimately leads to Macduff seeking revenge against Macbeth, contributing to his downfall.
mabeth wants to take macduffs child & wife away
Macbeth kills the wife and children of Macduff as part of his ruthless pursuit to secure power and eliminate any threats to his rule.
Because Macbeth believes in the prophecies so much, he thinks that he is safe because that is what the witches want him to think. The witches tell Macbeth to beware of Macduff, even though Macbeth thinks he is safe he wants to make sure he iscompletely safe so he decides to kill Macduff and his family but only suceeds in killing Macduffs family not Macduff, and the Macduff takes revenge and kills Macbeth.
In a sense. She feels that he is a traitor for abandoning her and their children in Scotland where they are in danger.
Macbeth didn't think Macduff was a threat because the witches said "None of woman born shall harm Macbeth." Macbeth welcomes this good news and, assuming Macduff was born the natural way, Macbeth thinks he has nothing to fear.
It's a two-part answer. One, Macbeth is a traitor and killed the King of Scotland. Macduff is loyal to the rightful heir, Malcolm. Macduff assists Malcolm in the retaking of Dunsinane castle and murders Macbeth. But Macbeth also hired assassins to have Macduffs family murdered. Macduff's wife and children were all murdered after he fled to England with Malcolm.