My husband was adopted at age 4 and raised by a wonderful family, with his parents marriage lasting 60 years. Recently, an unknown biological sister reached out and my husband found out that he was the 6th out of 9 children. The biological sister came for a visit. Shortly after the sexting & graphic videos started. When we went to visit their family, my husband & his sister turned the affair physical. I found evidence a few weeks later & we have gone no contact. Both are in their 50's. Is there hope for recovery in this type of situation? What additional steps might be needed for this scenario?