It is common to deal with manipulation when you are attempting to address another problem.  It is common to see eye roles or receive back talk when addressing aggression between siblings.  First of all, address everything and assume nothing.  Second, you need a strategy.  The following podcast is a Triple D Strategy when you are dealing with a second level of nonsense.  

Check out our new website at www.parentingdoctors.com

And See Dr. Dan’s new book: https://www.amazon.com/dp/1935576062/?tag=medrounpublic-20