Sick to my stomach as I write this with no where to turn without breaching confidences. Have 2 adult daughters 35/31 who I’m told by everyone are amazing human beings. Have been so proud of them their whole lives. They have a very close relationship. Daughter 1 married 5 yrs to a great guy, with 1 - 4 yr old daughter but there have been issues since the baby came… financial, communication, etc. Daughter 2 today in a word vomit while defending some opinions she expressed to me about her sisters character inadvertently told me my #1 daughter is involved in an affair going on since before her daughter was born. I am BESIDE myself because she asked me NOT to say it came from her! (She called back after upset with herself for having told me but felt unvalidated when I was defending her sisters character having no clue why she feels the way she does). I have known daughter #1 is unhappy and have been coaching her with communication, advising her to get out if she is that unhappy and she alone is in therapy at my recommendation for 2 years now. I am disgusted, disappointed and feel like a failure! I raised them better than this! I want to confront her but can’t reveal how I know. I feel like I am complicit by knowing and doing nothing. My son in law while not perfect deserves better! My granddaughter deserves better! What kind of an example is she setting? I am screaming internally. I have baggage when it comes to affairs having lived through a couple friends devastation when they experienced it. I am so disgusted with my daughter.. and I am so emotional .. .i am told her coworkers and boss know about it. I want to scream at her and shake her. It will kill me to not address this! But I don’t know how to handle it as my emotions are simply raging!