Is it wrong to have a crush on my adopted sister?

Anonymous
The thing is my parents decided to adopt her cause she had a few problems at home and my dad works in a place were they wanna help troubled teens. I've known her for a while and I've had a crush on her for a long time even before my parents decided to adopt her. Is this wrong or counted as incest? What should I do?
please excuse my English
Is it wrong to have a crush on my adopted sister?
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