Dear Steve and Shirley, a year ago I found out that my husband cheated on me with my sister. We were married for 9 years so it was not unusual for him to have a great relationship with my sis. They joked around and would play fight like they did not like each other. All along I thought it was cute and I had no idea that it was foreplay. I caught them in our garage one day, years ago, behind the car and my husband jumped up and told me they were trying to scare me. Boy was I stupid back then..........................