Here is a link if it in any way assists you on your quest with your dad: http://www.chaosangel.com/tia/
You can pretty much get the basics from the top page.

Tia was 41. FORTY-ONE. She was heavy — tho not proportionately so very much so (unless your dad is awfully tall) — out of shape and diabetic. Apparently had a few little candy hoards. That is literally it, and it was all very brutal to see.

At any rate, even tho of course your dad logically knows all of this sort of thing… if you think FORTY-ONE or anything else about the story might help, there you go.