Here's from Hamlet, Act 1. Scene 2
Fie! 'tis a fault to heaven,
A fault against the dead, a fault to nature,
To reason most absurd; whose common theme
Is death of fathers, and who still hath cried,
From the first corse till he that died to-day,
'This must be so.'
I'm wondering about the antecedent of "whose". Is it "heaven", "nature" or "reason" or all of them? It seems to me that it's all of them because of the word "common". However, "who still hath cried" suggests that it's singular.