Why did you choose to go after Harry instead of Neville?
■► I chose the boy I felt was most threatening to myself. Which, of course, would be the one most similar to me; a half-blood, I fear to admit. ◄■
I thought so. I just never thought you'd admit it; I was expecting excuses. Props, man.
Another question: How did you figure out that you were Slytherin's heir while you were still in school? Did you even know your mother's name?
■► No, I did not know my mother's name; I knew nothing of my heritage apart from the fact that my father was named Tom Riddle.
The fact that I could speak parselmouth first lead to me suspecting my relation to Salazar Slytherin. Through discovery that it was a very rare trait that my very own house founder possessed himself.
I researched all that I could about Slytherin. which lead to the discovery of the Chamber of Secrets. It took my first five years at Hogwarts to discover it's location and to understand everything about it.
Once I had gotten inside the chamber, it became clear that it was I that was the heir. ◄■