dean and sam find out that they have a half sister

What if Sam had a twin sister? This is the story of Dean and Sam with a sister, Alex.

Castiel, Dean, Sam, Adam, and the youngest and only femal Winchester, Taylor, travel the country fighting all sorts of creatures. But what happens when one or more of them steps out of line? Warning: Spanking, Do not like Do not read!

Dean and Sam have a sister She may not be quite so simple as they think... Includes Perpetually Confused!Castiel, Alive!Jessica, Not in Hell!Dean, and a New!sister! Better then it sounds, really!

[season four - onward] "Definitely a Winchester, with that foul mouth." Her name? Evie Dawson. She went to sleep in New York, but woke up with some annoying guy called Gabriel poking and prodding at her, and now, she has to live under the watchful eyes of Sam and Dean Winchester - who just happen to also be her half-brothers.

Kat doesn't want Sam back in her life after he left for college but Dean is dragging her with him to pick up Sam to help find their dad. Will Kat and Sam get along while on the road? Warnings for Eating Disorders and Self-Harm

Sarah Winchester left her family, but when she receives a call from her brother she's yanked right back in, except this time, their dad's missing.

A sister fanfic...Sam and Dean have always been there for their sister, Camille. But what happens when its time for her to follow her destiny? Can they let her go? Will she let go?

This is a fanfiction where Dean and Sam Winchester have a little sister, but there is a major twist to the normal Winchesters.

What happens when Sam and Dean find out they have a sister?

Dean and Sam have a sister. The sister is the middle child. Sam hasn't heard from the sister in 9 years. Dean hasn't heard from the sister in 6. The sisters name is Naomi.

Look out for Sammy. Take care of Tally. They were the most important rules in Dean's life. But then Sammy left for college and Tally changed into a different person. Now that Sam's coming back on the road, can things go back to how they were before, or has everything changed too much?

Sophia is Dean and Sam's 12 year old half sister, she decides to help them in a hunt she is then captured by demons. It is up to Dean and Sam to save her before it's too late. Rated T for language.

What if John saved a baby back in 89, and named her Aiden Anne. And she grew up as John's baby girl. May contain spankings of minors, also some chapters will contain mentions of injury (it is the Winchesters) or drugs. I will most likely jump around with ages (one story Sam will be 10, then the next 17, then 9) so this isn't in order. (This is all my Aiden-verse stories in bulk)

Sam and Dean are not alone, they have a little sister! Protective brother Dean, comforting but still protective big brother Sam. How do they respond to their sister being hurt? Some language!

"Dean, chill out," Sam intervenes gently. "I'm not having her go out like that!" Dean insists gruffly. Cas looks up casually and frowns at me. "See, even Cas agrees!" Dean says, but Castiel is simply looking at my heels quizzically. "I don't understand," he says slowly. "What do you gain in yourself by wearing those shoes to make you taller?"

"I always wished I had a dad," she admitted quietly, staring up at the stars. "I guess I should have been careful what I wished for. Adam and my mom would still be alive if we had never met John Winchester." "I'm... sorry." Deep blue eyes met hers and a large, warm hand closed around her smaller one. "For everything you've been through." (Future Castiel/OFC) (ON HIATUS).

Sam and Dean have sister named Jane. She hunts with them. Follows Season 4 & 5! Jane has eyes for a certain angel but will the forbidden romance be allowed to blossom? Uriel calls it an abomination. Castiel/OC Reworking. Reread chapters 1-3! 7/17/12

My take on what it would be like if Dean and Sam had a younger sister, Katie, and all the ups and downs they encounter growing up. Each chapter will be a one shot of some moments when the Winchester siblings were younger (before the series).

Anna Winchester fights to find her place in the world and in her family of three men, who are all hunters. Rated M for spanking.

Sammy makes some poor decisions while being watched by Dean. Sisterfic. Warning: Spanking

Dean gets Sam and Kris from school. The Winchester boys don't know that Kris is in fact their sister. Neither she or their father ever said anything. But now John and her mother are missing. Can the three of them get along? How long will it take for the boys to realize that is blood? Oh, did I mention Kris is half demon? Her mother being possessed a portion of her pregnancy?

On November 2, 1983 Mary, John, and Dean said goodnight to Sam and Troian...twins! This sister-fic follows the series from the start. This will follow the script and episodes to the T, so of course there will be spoilers. I do not own Supernatural or the characters!

Sam and Dean Winchester thought they knew everything about their family. Turns out they were wrong. They have a younger sister named Elizabeth (Eli for short) and she is a hunter. She is a part of the family business and both brothers never knew it! (Rated T for language because, let's be honest, if Dean didn't swear, what kind of story would this be?)

Katherine. She was alive. It had been so long since that fateful night when his twin was ripped from his arms when they were only 15. Now here she was, a college student. Hurt stabbed through him like a heated blade. Why hadn't she tried to find him? He thought she was dead.