They may be brothers and sisters in real life, but in the acting world, sibling actors are often fierce competitors. Sometimes they're even up for the same roles.
You could call these cases of sibling rivalry being played out on the big screen a real family affair, along the lines of "Mom always liked you best."
We've come up with a list of top actors who have competing brothers or sisters. Vote on your favorites of each brother-brother, brother-sister or sister-sister pairing -- and may the best siblings win.
Luke Wilson: This Wilson brother has had a vibrant career since the mid-'90s, when he hooked up with Wes Anderson for "Bottle Rocket." He's known and loved for comedies like "Legally Blonde" and "Charlie's Angels," but occasionally takes a turn into darker filmic territory like "3:10 to Yuma."
Owen Wilson: Starring in Woody Allen's "Midnight in Paris" last year took him up a few notches from the lovable goofballs he plays in popular movies like "Wedding Crashers" and "You, Me and Dupree." He's also a writer and was Oscar-nominated for his screenplay "The Royal Tenenbaums," costarring brother Luke.
Jake Gyllenhaal: His good looks and expressive blue eyes mixed with male sensitivity make him an object of affection for both sexes. Yes, he'll always be known for being Heath Ledger's honey in "Brokeback Mountain" and Jennifer Aniston's in "The Good Girl," but Gyllenhaal's quirky repertoire is all over the genre map.
Maggie Gyllenhaal: She played Jake's sister in "Donnie Darko" and has forged her own on-screen identity with films like the acclaimed "Secretary," her breakout 2002 cult hit. Her offbeat beauty and talent has scored her many fans, including her fellow double-voweled acting colleague, Peter Sarsgaard, to whom she's married.
Chris Hemsworth: He is hunky -- stellar good looks obviously run in the family -- but this Hemsworth sports the added allure of being a superhero, first playing the title role in "Thor" and now as part of the ensemble in the super-hit "The Avengers." He scored his first role in 2002 as King Arthur in a TV show.
Liam Hemsworth: Despite his recent role in "The Hunger Games," this handsome Hemsworth is almost as well known for dating Miley Cyrus, whom he met on the set of "The Last Song." He's only been acting since 2007, when he appeared in several short-lived TV series.
Emily Deschanel: She's been Dr. Temperance "Bones" Brennan on the television series "Bones" for seven seasons; prior to that, Emily has been gracing the small screen since the early aughts. She's had some feature film play in "Cold Mountain" and "The Alamo," but TV is what keeps her busy.
Zooey Deschanel: Her "adorkable" character on the freshman hit comedy series "New Girl" has already spawned an SNL spoof and her own iPhone commercial. This Deschanel started acting in 1998 and broke out big in the offbeat 2009 rom-com, "(500) Days of Summer." Many remember her as Will Ferrell's love interest in "Elf" or the sister from "Almost Famous." Both she and sis Em shoot their shows on the Fox lot in L.A.
Dave Franco: He played the biggest man on campus with the best drugs in this year's hit "21 Jump Street," but this Franco’s face is still new most moviegoers, unless they remember him from "Superbad." On TV, he’s had regular roles in shows like "Scrubs" and "Privileged."
James Franco: Although his Oscar cohosting gig last year with Anne Hathaway was considered a bust, Franco has a lot to fall back on. He’s somewhat of a renaissance man, teaching at NYU. He was a natural to play James Dean in a TV movie -- and Harry Osborn in the three "Spider-Man" movies. Among his accolades are a stoner of the year award for "Pineapple Express."
Ben Affleck: Despite bombs like "Gigli" and "Surviving Christmas," this Affleck has redeemed himself by directing such features such as "Gone Baby Gone" and "The Town," harkening back to his Boston roots and his early screenwriting Oscar for "Good Will Hunting." He’s directing and starring in a third feature, "Argo," and will also star in an untitled Terrence Malick film.
Casey Affleck: Ben was his benefactor at the beginning, going back to "Good Will Hunting" and continuing through "The Town," but Casey’s made his own name in films including "Tower Heist" and "The Assassination of Jesse James by the Coward Robert Ford." And oh, yeah, he got a supporting actor Oscar nomination for that one.
Kevin Dillon: The younger Dillon was Drama, the blustery big bro on "Entourage," blending a realistic dose of struggling-actor angst with bravado when things went his way. Emmy voters were continually impressed, showering him with three nominations for the role during the HBO comedy's eight seasons.
Matt Dillon: He came to prominence in 1983 with "Rumble Fish" and "The Outsiders" and has rarely left the spotlight since. His repertoire ranges from comedy ("There's Something About Mary") to drama ("Crash"), and his tall, dark handsomeness still brings to mind the brooding outsiders he played at the beginning.
Joseph Fiennes: He left an indelible mark in "Shakespeare in Love," and the Bard has been somewhat of a muse to Joseph, who's also appeared in "The Merchant of Venice," among many other credits. He’ll next be featured in a thriller, "The Diplomat," alongside Hayden Christensen.
Ralph Fiennes: Veering from his awards-worthy turns as a Nazi ("Schindler’s List") and an evil dark lord ("Harry Potter"), this Fiennes has also logged much screen time as a love interest ("The English Patient"). Recently, he’s focused more on the dark side (Voldemort and Hades in "The Titans" movies) and has also tried his hand at directing ("Coriolanus").
Dakota Fanning: This child star is old enough to vote now and has a shelf filled with honors from her turns in movies like "Charlotte's Web," "The Secret Life of Bees," "I Am Sam," "Taken" and "War of the Worlds." All growed up, she got to kiss Kristen Stewart in "The Runaways." Fanning made her debut on television in 2000 with parts in "ER" and "Ally McBeal."
Elle Fanning: How many working actresses were first cast at the age of two? That was Elle in 2001's "I Am Sam," the beginning of a vibrant career for the now 14-year-old. Thus far, she’s won attention-getting roles in films including "We Bought a Zoo," "Super 8," "The Curious Case of Benjamin Button" and "Babel."
Joan Cusack: On-screen, she often plays the acerbic yet wacky best friend or sister. Cusack first made her mark in the late '80s with "Say Anything" and "Working Girl," and has a regular role on Showtime's "Shameless." But one thing remains constant: She's always funny.
John Cusack: His current starring role in "The Raven" is just the latest in a lengthy career of unconventional choices, like "Hot Tub Time Machine" and "Being John Malkovich." Coming of age in the Brat Pack '80s, Cusack has outlasted most of his contemporaries and stars in six upcoming films.
Mary Kate & Ashley Olsen: The twins, who were brought up on television beginning as adorable infants on "Full House," have pretty much relegated acting to the back burner as they continue to grow their multi-billion-dollar fashion empire. Ashley's last feature was 2004's "New York Minute" while MK stays onscreen in "Weeds" and last year's feature "Beastly."
Elizabeth Olsen: Three years younger, this member of the family won accolades for her breakout role in Fox Searchlight's "Martha Marcy May Marlene," along with tons of good press for just being an Olsen sister trying not to play on her family connections. She’s currently shooting "Therese Raquin," in the title role.