Welcome, Kosta - you may find the Parent's Discussion forum here to be helpful for you. However, I would mention this... that your daughter did not ask for her condition, and is not trying to disrupt your life. Hopefully, as you find more ways to work with her instead of against her, things will improve at home... forgive me, but the initial post gives an impression that you see her as a problem, an obstacle for your son's life.
M.
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For those who seek an alternative, it is coming.
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