I don't understand this one part in this book.That i just st

arted.  I haven't read past around page 127 yet.

Now, let me explain it ok? This is gonna sound stupid but anyway.

The character vronsky, who lives in st. Petersburg as far as I know goes to Moscow to meet his mother there who apparently Also lives somewhere besides Moscow, because she travelled there by a train meaning she doesn't live there apparently.

Then later vronsky goes back to st. Petersburg wher he lives (its established that he lives there cuz he goes back to his apartment who he's letting one of his friends borrow it for a short period of time.)

I'm confused, if he lives in st. Petersburg, and his mother lives somewhere besides Moscow sorry I don't remember where...then why do they both meet in Moscow? Why do they both go there?

Wouldn't anybody else just go to where one or the other lives?

I understand why vronsky would go there I guess, because he is dating kitty at the time and she lives there? but why would vronsky's mother be going there when she could just go to st Petersburg at a time when vronsky is there? Or does he have two residences that would seem odd to me at least though.