Madge and The Doctor in “The Doctor, the Widow and the Wardrobe”

Why are you doing all this?

I'm just... trying to take care of things. I'm the caretaker.

That's not what caretakers do.

Then why are they called caretakers?

[Pauses, caught, then:] Their father's dead.

[Pause] I'm sorry.

Lily and Cyril's father, my husband, is dead, and they don't know yet because if I tell them now, then Christmas will always be what took their father away from them and no one should have to live like that. Of course, when the Christmas period is over, I shall... [she pauses] I don't know why I keep shouting at them.

Because every time you see them happy, you remember how sad they're going to be... and it breaks your heart. Because what's the point in them being happy now if they're going to be sad later? The answer is, of course, because they are going to be sad later.