The doorbell rang loudly through the Cohen's house. Sandy put his coffee mug down on the counter and hurried to get it. When he opened the door he saw a young girl standing outside with her back towards him. She turned around. Sandy thought she looked beautiful, with her light brown hair cut just over her shoulders. She looked at him with big, brown eyes, and smiled.

"Hi. Are you Sanford Cohen?" she asked without introducing herself. She was dressed in a short jeans skirt and a black tank top.

"Yes. Are you looking for me?" he said. He was a bit confused, he had never seen this girl before, but there was just something about her…something familiar.

"No, absolutely not" was her answer. She looked at the man standing in front of her, when she saw the confused look on his face she knew she had to explain herself a little more fully.

"I'm looking for Kirsten Cohen. Is she here?" the girl said.

"Well, she's upstairs. I can go and get her for you" Sandy offered, no idea why this young lady would wanna talk to his wife. He had first thought she was a friend of Ryan or Seth.

"You know, that sounds awesome. Thanks" she said with a sweet smile. Sandy went upstairs to find Kirsten.

The girl looked around. So this was where Kirsten Cohen lived.

"Honey, there's a girl down stairs looking for you" Sandy said when he found Kirsten in their room.

"Oh, did she say what she wanted?" Kirsten asked.

"No, why don't you go and ask her." Sandy suggested and followed Kirsten out of the room.

"Hello?" Kirsten said, the girl had her back towards her, she turned around at the sound of her voice.

"Hi, you must be Kirsten. I'm glad to finally meet you" the stranger said.

"Ehm, nice to meet you too" Kirsten didn't know what to say. Sandy was beside her.

"What's your name?" he asked.

"Oh my God. I haven't introduced myself have I?" she laughed. "I'm Sienna" Sienna said.

"Ok Sienna. What do you want?" Kirsten asked, trying to sound polite.

"I guess you've never heard of me. This is going to be tough, but I have to say this. We're sisters." Sienna said. Kirsten took her time to let these news sink in.

"What the hell do you mean?" she said loudly.

"Ok, I know this comes as a shock to you. I found out who my mother was just before my dad died last week, and that she had a daughter. One of the last things he said to me was that I have to go and find my sister, he didn't want me to be alone" Sienna explained.

"How do you know it's Kirsten?" Sandy asked, he didn't like this. Kirsten sat down on the couch. Sienna moved herself so that she was standing in front of her.

"You used to be Kirsten Nichol, right? You're the daughter of Caleb an Anna Nichol. You married your husband about twenty years ago and you have a son together. If everything I just said is right, you're my sister" Sienna said. Judging by the looks on Sandy's and Kirsten's faces, she knew she was right.

"How could you know that?" Kirsten said, she was really shocked and scared at the same time, scared because this complete stranger knew so much about them.

"My father had a friend who's a cop, and he had been told to check you guys up, if you maybe had a violent past or had been serving time for some crime. My dad was very protective" Sienna explained.

"Hold on" Kirsten's brain was finally working again. "You said you lived with your father, right?" she asked. Sienna nodded. "That means we have the same mum" she finished the sentence for Kirsten.

"Oh my God! I can't believe this!" Kirsten was angry, she got to her feet and just stood there, she didn't know what to do. Last year at Chrismukkah she had found out that her father had cheated on her mum, but now her mother? Wait, no that would have been impossible. She calmed down a bit, this was just a stupid mistake.

"Sienna, this must be a mistake. We cannot have the same mum, we would have noticed it if she got pregnant" Kirsten said. Sienna nodded.

"Yeah, that's not so easy to hide. But do you remember when your mum worked ten months in France on a confidential project? And she forbade your father to come and visit her?" Sienna said. Kirsten just stared at her. How the hell could she know that?

Sandy placed his arm around Kirsten's waist. This couldn't be happening…

Sienna suddenly felt powerless, she had always been strong, but now all her strength disappeared. She had never met her mother, her father just died, had no other relatives and her sister didn't believe her.

"Please" she begged. "Please trust me. I have no other family"

Kirsten looked at the girl in front of her, what could she be? 17? And no relatives but her…

"Maybe we could do a DNA test, just to be sure" she said with in a milder voice. She moved away from Sandy's arm and put hers around Sienna. Sienna smiled.

"Ok. That sounds good."

"Do you have any place to stay?" Sandy asked. Sienna looked up at him.

"I came here yesterday, I stay at a motel, I think it was Mermaid Inn", she said.

"Ok, do you want to stay for dinner?" Kirsten asked. Sienna looked at her.

"If you don't mind if I do" she answered.

"Of course we don't" Sandy said. He walked off towards the kitchen after receiving a look from Kirsten. Kirsten now turned to Sienna.

"We need to talk"