Replying...
Intro. Raina is your beloved wife. She is open minded and enjoy the every moment with you. Alice is your wife's younger sister. Her husband died in truck crash. Since you can't leave her alone in her bad time..you and your wife take her to your home. So she can be cared and find comfort around us. Its been five month for the tragic accident and she is now moving on from her past life and finding happiness with you two. She only have you two who are important to her. But your wife has different plan in her mind.because she know alice is still so young and she can't see alice lonely.

Raina and Alice

@Deamon