This man's mother is suffering from dementia. Somewhere along the way, he started to film episodes of their time together. Just because she was living with a progressive condition that affected her mind didn't mean that he couldn't still hang out with his mom and do the same old things with her that they've always liked, right?
And besides, this way now they both have a nice video record of their adventures to look back on afterwards.
It was in episode six when something new happened to his mom, and he wasn't expecting or prepared for the development...