You may need to think about sitting your W down and telling her that if she cannot stop taking sides that you will be in charge of the discipline until she grows up to be a rational adult. If you don't and she continues to treat S9 like this, you will have more problems coming that you can shake a stick at! I doubt she is going to overcome her self-centeredness enough to be much help for a good while.
Something to be said for Tact, unless you like having your face ripped off.
Experience is a brutal teacher, but you learn. My God, do you learn. - C.S. Lewis
Life is usually all about how you handle Plan B. - Jack3Beans
Listen without defending; Speak without offending - FaithinAK
