Question: Is the narrator of 'Finnegans Wake' the "old man with a tenuous connection to reality"?

The primary mode seems to be a dialogue between the narrator and the reader -- the I and We constantly talking to the You.

Given that one of the themes of the book is the fallibility of the historical record, it feels akin to asking your grandpa what it was like back in the day and getting a rambling, somewhat-coherent story that occasionally contradicts itself and sometimes breaks into song.