The Doctor might have objected to minors being the ones to get this news, but it was legally taken care of, and it didn't seem right to keep such information from them. Someone had to be told, and if these children were all that the patient had, then that's all he had.
"The patient," The Doctor said, "Is not exhibiting visual, auditory, light, or pain reflexes. Due to the head trauma experienced during his accident, this is not uncommon and he is currently experiencing torporific conditions and will be for an undertermined amount of time."