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Nice to know that your father is fully awake and GCS is intact at 15. A remaining hematoma can sometimes need extra checkups. His high blood pressure is dangerous and the doctors should address it as it has an impact on the recovery. The weakness in the left side of the body is probably due to the intermitted functioning of the hematoma in the brain. You must get advice from his neurologist for personalized management, which will cover such measures as controlling blood pressure, monitoring his symptoms carefully, or seeking additional intervention for a hematoma.

It sounds like he experienced a severe head injury at a young age, resulting in significant impairments. Given the complexity of your brother's situation, it would be best to seek the expertise of specialists such as pediatric neurologists or neurosurgeons, 

Glioblastoma is generally not considered hereditary. While some cases may be associated with genetic conditions, the majority occur sporadically due to a combination of genetic and environmental factors.

The problems your wife has are most likely due to the arachnoid cyst. This is a small, fluid-filled pouch that develops in the brain and may lead to pressure and dizziness. Although very serious, not every arachnoid cyst requires surgery. This issue in the long term may be diminished by consistent monitoring by a neurosurgeon to check for early warning signs. In some cases, the operation is an answer to avoid the worsening of the symptoms or the visible growth of the cyst. The road to recovery can provide the most appropriate therapy options with a neurosurgeon to come up with the best possible solution.