That’s pretty much what valpal1 had discovered too. AQW apparently regarded Swing as a daughter. And maybe she actually is.
Takes care of the mystery of Swing and the houses. Doesn’t tell us why Warner decided to blow himself up, assuming that his reasoning could be understood if we heard it.
If cancer who would he have told? Perhaps he thought Microwave radiation caused it?
Who knows. HPPA regulations and all that, you probably can get in trouble even after someone dies and it does not sound like his mother is talking.