I am also a caregiver, the son of a patient, and I understand the unimaginable human difficulties when what we want makes the patient afraid. Non-cooperation, denial, running away... exhaust us every day, but let's sympathize with them, because we are not patients. I pray for you. Please maintain your health and spirit. Your brother is already a miracle in SCLC (with just standard chemotherapy and radiation), and you are also a great person. This is strictly the patient's fight, but when a patient has cancer, it is the fight of the whole family, of those who love the patient.
I pray for both of you.