DJinn Attacks, How do I stop the attacks Options

I have a friend who lives in a house with a Djinn that was conjured by another person who lived there (along with an imp) before her. This thing is terrorizing her oldest daughter and her arthritic 80 year old mother. It has pulled her mother under the bed and even thrown a knife at her mother, broken knick knacks and such. It terrorizes only the oldest, her ears hurt at times when it manifests and it leaves and acrid, sulfuric or feces smell. I am not strong enough to bind this thing or banish it from her home, is there anything that can be done, traditional methods have failed. It isn't happy im involved in the situation (that's when it broke her knick knacks). Can you suggest any other forms of help?

One thing I have learned is that Djinns, like humans have free will
to choose their faith. also like humans, you have some really good ones,
some okay ones, some bad ones, and some that should be on some
serious psychotropic drugs, or in a straight jacket with the key thrown
away. (Ive known some humans that belonged in the latter categories).

The Wanderer