Dear Abby: My sister is having an affair with a wealthy older man — and her husband knows about it

A reader has contacted Dear Abby seeking guidance regarding a sister who is having an affair with a wealthy older man. Although the sister's husband is aware of the relationship, the family is currently weighing the decision of whether to inform the man's wife about the situation. The individual is questioning if contacting the spouse to expose the affair is a good move, seeking professional advice on how to handle this complex family conflict.