Dear Annie: It has recently come to my attention that my middle adult son has molested my adult daughter when she was 8 years old. She broke down and told me tearfully last week. She is now 23, and he is 31. And I am completely at a loss of how I should feel, think, react. I’m basically an emotional wreck. He is married with four children (whom I now fear for), not to mention what his wife would…