You're such a talented writer! You really capture Martha and Charles--from the little I know of both of them--very well! My fav lines here has to be:

"You have no discretion, Martha…you never have.”

To which, she would only snort and look away from him. “Discretion, Charles? No inquiries into my welfare? No questions about how I’m feeling?"

I LOVED that! Perfectly executed dialogue. Great job!