AWWW Geeez, Candy! That IS a tough one!
From this side, it seems to me that you can just tell your sibs, "Sorry, but no." No time off, no money, etc. Before your last meltdown, I know I said "confront her." Now I'm not sure that would be wise.
Sweety, I don't have any answers for you, but you and I can sure discuss it! Most times, when you have a sounding board, things become clear on their own.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.