In the hospital, there was a female child who was affected by a really rare and high disease. She had a brother who was just 6 years old.
Her brother himself was affected by the same disease and he survived supernaturally and had developed antibodies to battle such disease.
Doctors found that a girl can only be recovered by transfusion from her 6 years-old brother. Doctors knew it'll be an extended process and boy had to travel through the clinical process for transfusion in order that they thought to clear it from him first and make him agreeable before going ahead with transfusion.
So a doctor visited a child and asked him, "If you give your blood to your sister then she is going to be healthy again. Are you sure about offering your blood to your sister?"
The kid hesitated for a short time then said, "Yes, I'll save my sister" After the transfusion process began, the boy shifted in the same ward and was lying next to her sister's bed smiling. Slowly his smile vanishes and he searched to the doctor and asked in quivering voice; "Will I die right away, Doctor?
Boy, misapprehended doctors once they asked him about giving blood to his sister. The doctor looked out the innocent boy and thought to himself, "Boy thought that he had to give all the blood to her sister, and then, he will die, and yet he accepted to give blood to her lovely sister and gave up his life for her."
The doctor visited the boy and cleared what he had misapprehended.