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I am very sorry to learn of this matter.
Unfortunately, you are going to need to file an appeal to deal with this matter.
If you and your sister are trying to litigate this matter "pro per" (without an attorney) you are going to want to hire a lawyer - quickly. The Court's order to sell the property will be effective immediately, even if you file an appeal it will still be carried out unless you also file a "Motion to Stay." (But a motion to stay is not automatic).