Court_Knee, it is NOT your fault, Hon! Your parents are adults and responsible for their own actions. Honestly, you don't have that much power over them, Sweety.
It really is upsetting to see them fighting when you just get home from the hospital. That's the last thing you need, but... they need to learn to behave better than that, especially in front of you kids!
It's NOT your fault! It's theirs for acting so immature, for pity's sake!
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.