Sibling rivalry between adult siblings

hey, for a major in my higher school certificate, I am reseraching and doin a project on sibling rivalry. my topic question is does sibling rivalry exist? if so, does it continue in to adult life?

im hoping someone who has indept knowledge would be...

able to give me some good facts and information about sibling rivalry bwetten adults, thats is.. fighting/competition/ jealousy between sibling when they are older.
some things that I would really like ( plus any other extra detail =] ) are
-the causes of sibling rivalry between adults and if they are different to the causes when they are children
- does siblign rivalry usually continue into adulthood?
- new causes of rivalry ?
- do the causes of rivalry in the past play a role in the future?

any information wud be great.

thanks for your help! much a ppriciated =] x3 . stana

I'd strongly recommend visiting the library researching this. Try checking out books on sibling rivalry, psychology, the journal of psychology, etc...we'll help with strategies on how to do your homework, but we're not going to do it for you.

Thanks for understanding.