By Harry Howard
Published: 19:16 BST, 16 May 2019 | Updated: 19:16 BST, 16 May 2019
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This is the heartbreaking moment that a US Army veteran with dementia cannot remember his son's name.
Kenneth Keene Sr, 70, from Philadelphia, who was diagnosed with dementia in 2014, is filmed by his son as they have a conversation while in the car.
But a smiling Mr Keene, while able to say his own name, repeatedly calls his son 'John' when asked.
This is the heartbreaking moment that a US Army veteran with dementia cannot remember his son's name. Kenneth Keene Sr, 70, from Philadelphia, who was diagnosed with dementia in 2014, is filmed by his son as they have a conversation while in the car
The clip is part of a series of Youtube videos produced by the younger Mr Keene, 47, entitled 'The Journey with ToughKenaMan', documenting his father's disease.
The video starts with the 70-year-old saying to his son, 'do you know who I am?'
When Mr Keene Jr replies, 'you're