Movie question? it was more than 10 years ago?

i think it might be russian. but these 2 girls are friends and at the end of the movie. they killed one of the girl's mom and then one of the girls leave on a ship and the other girl is heartbroken. its kind of a sick movie but i would like to know the title of it.if you don't know the title of it. Can you tell me the word is when you kill your mom or something?

thanks!

the girls kill their mom with a rock when their walking down a trail.

Heavenly Creatures (1994)
http://www.imdb.com/title/tt0110005/

Directed by Peter Jackson (Lord of the Rings trilogy, King Kong, etc.)
Starring a very young Kate Winslet in her first movie role.
It was a British/New Zealand production, not Russian.

It is based on a true story in New Zealand during the 1950s.
Really good, yet disturbing fantasy film.
http://en.wikipedia.org/wiki/Heavenly_cr...

Actually, the HOMICIDE associated with killing parents or mother is called:
PARRICIDE - the act of murdering one's father, mother, or other close relative that holds a parental-like role
-or-
MATRICIDE - the act of killing one's mother

Killing a parent is called
parentside, a variation of the word homiside