Hi, and welcome to Pet Talk.

Sorry to hear you have a "problem child" I am actually going through something similar with my two - enought peace and quiet to convince me that all is ok - and then all of a sudden they are ripping each other apart!

Over the past two weeks (mine have been together since October), things have improved. I have received loads of advice and encouragement from others here, and I also keep them totally apart at bight - this seems to be giving them enough of a "time-out" that they can at least tolerate each other during the day.

Have Spunky and your other 5 cats always lived together? Is it only the location (ie move to your Mom's house) which has changed, or have there been other cats/animals introduced?

Good luck, and keep us posted.