I am a jealousy wife....

I actually don't like my husband sister. She always act very good In front of us but talk behide our back. She often Whatsapp her brother which is my husband and talk about stuff and she will used ? to end her conversation but my husband will just reply with a smilling face. I am way too jealous about stuff... And I hope I can get over with my jealousy soon. She is close to her brother and I really hate her but they are blood brother and sister so I can't really do anything about it. Just hate myself from being so jealous.