Yaaayyy...welcome me to d table...ok naaa...I would want to flow with Essence Beats.Since you've got no proofs,it may not be wise to be confrontational.You need to be sure but please make sure you are not being paranoid or in any way jealous of your sister.I think you should concentrate on your personality and boost your self esteem.Try to be more expressive with your hubby and your sister.I would encourage you to develop a positive attitude about this.It may be difficult especially if this whole thing rings so true in your mind-Show her more love!. If she has any conscience and loves you as a sister,that could disarm her,at least she may move to stop whatever it is you believe she is doing with your hubby before it gets really ugly.You would have saved your marriage and saved her from herself.I wish you the best dear...