Answer: When an employee is related to top , the customary leverage equation shifts dramatically. Because of her special relationship with the president, Rachel has more influence than her colleagues and possibly even her managers. That may not be fair, but it’s a fact of life.
While many “connected” employees try hard to avoid any hint of special treatment, others take full advantage of their unique circumstances. The unfortunate soul who bears the burden of managing this power imbalance is the immediate supervisor, so that’s where your husband needs to go for help.
In talking with his boss, Scott’s objective is not to trash Rachel, but to keep her from impeding his success. Therefore, his agenda must include only actions which affect him directly. He should ask for guidance in dealing with Rachel’s stonewalling, misrepresentations and inaccurate instructions. The fact that she likes to socialize is really not his problem.
Finally, Scott needs to stop obsessing and learn to leave Rachel at the office. By allowing her to dominate his conversations at home, he's giving her far too much power to affect his life.