this title refers to:
Jason Scott-Harris, becasue he is the biological son of Desmond
a book or a trilogy in the destiny of dreams series, for example it is currently the title of the first trillogy of the 2013 Journey to D'zeron version.
the only person who could open the message in the wall Desmond left for the next Paragan. which turned out to be Jason and Harris together, so for the wall to open the two of them had to be there together.