My lane of thinking, as well.
To get back to Tom Riddle, I finally figured it out after a year or so (oh, I know I'm dim to not have figured it before...)
In the beginning of
Goblet, when the maid finds the Riddle's dead, here's what it's GOT to be:
It said it was Mr, Mrs and Tom Riddle. Well, if Tom (the younger) and Tom (the father) have the same name, and someone reported seeing a pale-faced boy entering the house earlier that day, then hey--it was Tom (the older) who was killed--and by his son at that. He-who-must-not-be-named, who was Tom at the time, killed his father. And it must have been out of hate, for leaving him and his mother when his father found out his mother was a witch!
*REVELATION...*
It just took me forever to figure this out. I KNOW--I'm dimmer than a 12 watt bulb.
Does this make sense to everyone else? It makes perfect sense to me (except for the fact that he killed his father--ack!) and it was like a lightbulb went on in my head when I figured it out.