plot explanation - What's wrong between Phoebe and her twin sister Ursula in Friends?

There is an
episode of the very popular TV series Friends wherein Phoebe says that she wants to
patch things up with her twin sister before their 30th Birthday (in a flashback in href="http://www.imdb.com/title/tt0583489/">The One Where They All Turn
Thirty).

Why do Phoebe and her twin sister Ursula
never talk to each other?

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class="normal">Answer

I don't remember any
specific reasons why they dislike each other, but Ursula was born 1 minute earlier and
did everything earlier so was deemed the better of the two to family and friends.

In episode 1.16 - href="http://www.imdb.com/title/tt0583568/">The One with Two Parts (Part
1), the following conversation takes
place

Rachel: Um, Pheebs, so, you guys just don't get
along?

Phoebe: It's mostly
just dumb sister stuff, you know, I mean, like, everyone always thought of her as the
pretty one, you know. Oh, oh, she was the first one to start walking, even though I did
it, later that same day. But, to my parents, by then it was like "yeah, right, well what
else is new"?

Also, the fact
that Ursula doesn't care about Phoebe's feelings, including not showing her the suicide
note that their mother left (Episode 4.01 - href="http://www.imdb.com/title/tt0583620/">The one with the
Jellyfish)

Ursula: No, I umm, I read about her in Mom’s
suicide note.

Phoebe:
There-there was a suicide note?! (Ursula nods ‘Yes.’) Well, do you still have
it?

Ursula: (disgusted) Hang
on. (She goes into her apartment and slams the door in Phoebe’s
face.)

Phoebe: I can’t
believe you didn’t tell me there was a suicide
note!

I'm sure there are more
references etc. but this should help.