The writers of "Brothers and Sisters" obviously had no clue about familial connections works. Half brothers and sisters share at least one parent. So by having those characters have a fling, they were actually having an incestuous relationship. Seems someone would have caught that.
8 Famous On-Screen Siblings That Fell In Love In Real Life

We’ve been raised watching movies and TV shows all our lives, so we’re pretty used to the nature of the character being portrayed on-screen. What comes as a surprise is when the characters playing siblings in reel life, begin to date in real life, like Ian Somerhalder and Maggie Grace from Lost, or Dean-Charles Chapman and Nell Tiger Free from Game of Thrones.
As surprising as this may sound, wait till you explore the list created by Bright Side of these Hollywood lovers who played kinfolk on screen, but dated behind the scenes.
1. Ian Somerhalder and Maggie Grace — Lost
2. Chris Pratt and Emily VanCamp — Everwood
Chris and Emily met on the set of Everwood, where they starred as siblings. They immediately hit it off. Although people were creeped out by their relationship, the couple stayed together for 3 years.
3. Amy Poehler and Will Arnett — Blades of Glory
Amy Poehler and Will Arnett played a brother-sister duo in the movie Blades of Glory. The couple was pretty much married while filming this, which made their marriage more hilarious at the same time.
4. Emily VanCamp and Dave Annable — Brothers and Sisters
Emily VanCamp made it on the list again. She played Dave Annable’s sister on Brothers and Sisters. And because of their chemistry, the writers of the show had to write a plot twist where they later discovered that they’re actually half-sister and brother. And since they shared no blood, they were available for a fling.
5. Dean-Charles Chapman and Nell Tiger Free — Game of Thrones
While Jamie and Cersei had their own chemistry to deal with in Game of Thrones, their children, Tommen Baratheon (Dean-Charles Chapman) and Myrcella Lannister (Nell Tiger Free) began dating off-screen. This news overwhelmed Game of Thrones fans to the core.
6. Michael C. Hall and Jennifer Carpenter — Dexter
Michael and Jennifer also played step-siblings in Dexter, and gradually, their work relationship turned into dating after a short time. They got so involved with each other that they ended up getting married in 2008, but then got divorced in 2011.
7. Lauren Graham and Peter Krause — Parenthood
In Parenthood, Lauren starred as Peter Krause’s on-screen sister, but no one could deny their off-screen chemistry. They have been dating since 2010 and are one of the most adored couples in Hollywood.
8. Carrie Fisher and Mark Hamill — Star Wars movies
One of the most famous scenes of the Star Wars franchise was when Luke and Leia shared a kiss before finding out they were siblings. The scene must have had quite an impact, because they had a short-lived affair back then.
While watching these shows and movies, could you notice the chemistry between the actors? Share your thoughts with us in the comments below.
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