What does malcolm ask Macduff?

Macolm, while hiding out in England and seeking aide there, is approached by Macduff to come back and take control of Scotland as the rightful heir. Malcolm tests Macduff's loyalty as Macduff used to be close to Macbeth. Malcolm presents himself as a tyrant with an unsatiable lust for women and power. Malcolm asks Macduff why he is not home with this family.Malcolm finally accepts that Macduff is there for the better of Scotland and not for Macbeth. Macduff learns that Macbeth has his entire family slain to punish him for his absence from his coronation. Malcolm asks Macduff to use his grief over their deaths to seek out Macbeth and avenge his family's murder.