The thing is, Aston Martin should be in a solid 3rd in the Constructors Championship, but due to having a rabbit in the second car they will probably end up fifth. That will cost them millions. Son or not, he shouldn't be anywhere near an F1 car. He simply is nowhere near good enough.
Perez is driving like a man who knows he is out on his ear. Sadly, he looks completely broken. I can't think who RB would get in to replace him, but surely Perez cannot stay on, for his own wellbeing if nothing else.