Why Does My Mother in Law Ask the Same Question Every Visit?
Repetition is the cheapest pressure humans have, and everyone works that out by instinct long before they could name it. The same question returns because of: 1) the illusory truth effect, a thing asked often enough stops feeling like a question and starts feeling like a settled expectation 2) the Zeigarnik effect, an open loop nags, so she keeps the subject open on purpose 3) plain measurement, she is checking whether your answer has softened since last time. She is not forgetful. She is taking attendance.
What is actually happening
The question is not a question
Each repeat costs her nothing
Your answer softens by inches
Then it is a plan
How it escalates
Give the exact same answer three visits running and see who gets uncomfortable first.