That is a good answer, add a bit of your personal fears (don't share here) and it will be good.
It’s basically one person trying to communicate and the other isn’t. So true?
The correct answer is C. Complete the appointment, manage his problem, and talk with family elders.
The brother is unwell and needs to see the doctor there and then so rescheduling would be detrimental to his health. His problem needs to be managed now. Then after the appointment talk with family elders to get the proper medical history to take with you to the follow up appointment.