What would you do if a family member told you that they were 'fooling around' (sexual activity but not full blown intercourse - not that it really makes a difference) with a married man who has three children? Also this man is her senior at work. 
Changed name for this, not that I think it matters too much because I am not on here enough really. Don't want to go into it anymore than that, just want advice.
Would you do anything? If you would, what?
TIA