Dakota and Elle Fanning are getting ready to make that inevitable move all showbiz siblings make and work together. Just when I didn’t think it was possible to make a Dakota Fanning movie any more annoying, she’s gone and paired up with her sister. To make matters worse, the adult version of the moppet, Cameron Diaz, will headline as the two sisters’ mother in My Sister’s Keeper, an adaptation of the novel by Jodi Picoult.

In the novel, a young girl sues her parents for emancipation after discovering they only had her to harvest genetically matched organs for her older sister, who suffers from cancer. Younger sister Elle will play the young girl, with Dakota playing the cancer-plagued older sibling. Cameron Diaz will play the mother to the children.

In the original story the siblings are both in their teens, but the news, as reported by Variety, states the decision was made to play the girls younger (opening the way for the Fannings to play the roles) because it was age-appropriate for Diaz. Right – because the actress isn’t in her mid-thirties and it would be outside the realm of reasonable belief to put her as the mother of teenage daughters. The fact that casting the Fannings over the Olsen twins or the Duff sisters actually brings some credibility to the film is irrelevant. What bothers me about the change is that, knowing the story, I have to worry what else they might change in the interests of the talent involved.