Why are these lines from Act IV important in the plot of the play?

Ross to Macduff.

Your castle is surpris'd; your wife and babes
Savagely slaughter'd: to relate the manner
Were, on the quarry of these murder'd deer,
To add the death of you.

Question

Why are these lines from Act IV important in the plot of the play?

Ross to Macduff.

Your castle is surpris'd; your wife and babes
Savagely slaughter'd: to relate the manner
Were, on the quarry of these murder'd deer,
To add the death of you.

anonymous · Answer

It means, they have lost it all. Like it couldn't get anymore worse considering her mom and babes have ben slaughter'd. So the only thing that could make it even more worse, is them also being killed