Answer: Frontotemporal Dementia
Explanation: Frontotemporal Degeneration/Dementia is an umbrella term for a group of disorders brought on by loss of nerve cell in the frontal lobe of the brain. This causes behavioral changes and trouble with language, speaking or understanding. The disorders it covers include behavior variant frontotemporal dementia and primary progressive aphasia.
Mr Weatherford's behavior has changed from the hard-driving lifestyle and unavailability of the past to a laid back and amiable behavior.