Can brothers and sisters sleep together ?

My sister is crying over her favorite singer she's kind of upset about a comment she read about him on YouTube last night she said they said he died of a drug overdose that's not true he's still alive it upset her he lives in another country he rarely comes here it makes her sad because she knows she'll never get to see him also he's married to a girl about her age he's almost 60 she said it isn't fair. She's madly in love with him she worships him. How can I calm her down ? Is it ok if she sleeps with me ?