That's fantastic Karma.
My 2 daughters fight amongst themselves all the time & drives me nuts.
In the weekend I calmy sat them down & suggested that rather than be negative towards each other that may perhaps trying saying 1 thing they "like" each day.
I am pleased to report that several days later they are interacting & taking a positive interest in each other & are still using the "I like it when...." sentence.
Just the fact that we mothers are trying different methods deserves a pat on the back.
Keep on keeping on