# Voltage Referencing Question

I just had some doubts regarding voltage references, etc after viewing this circuit:

I'm usually used to using ground as a reference and assuming that it's 0V. In this case I'm a bit confused.

Q1: In this scenario, is the source of the bottom MOSFET equal to -Vgs which is equal to -Vds which in turn implies that Vgs = Vds?

Q2: Say I labelled a new point between the MOSFETs as point B. Now could I say that the Vds of the bottom MOSFET is equal to Vb-(-Vgs) or Vb-(-Vds) or would it just be that Vds=Vb?

Q3: Lastly, If I did ground the bottom MOSFET source as usual, wouldn't the following be true $$-V_{GS}=-V_{DS}=0$$ Now, couldn't we just exclude that last equals sign and from that say that Vgs=Vds? I feel like I've just confused myself even more. Never thought about this before