As executor (or personal representative if the estate is in Colorado) your sister has a fiduciary duty to deal fairly and honestly with all of the beneficiaries. If she does not do so, then you have the ability to sue her for breach of fiduciary duty and seek a judgment from a court for your damages.
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If he did not leave a will, she is the personal representative or administrator (same job, different name basically). Does she have to be honest? Of course. What do you do? You can hire your own lawyer and ask questions or force her to produce an accounting of the estate transactions (basically all the money that goes in and out on paper presented to a court for approval). You can also have her removed if you find she is not doing her job as a fiduciary. I suggest hiring a lawyer.
This is not legal advice nor intended to create an attorney-client relationship. The information provided here is informational in nature only. This attorney may not be licensed in the jurisdiction which you have a question about so the answer could be only general in nature.
I assume that a court appointed your sister as Personal Representative here in Colorado. And I absolutely agree she is required to be honest. If you are concerned about her actions you can hire your own attorney to make sure your interests are protected. You can also ask for more court supervision over the probate of your father's estate. If you find out she is not being honest or not acting appropriately you may be able to have her removed as personal representative. I would suggest you speak with a probate attorney and discuss all your options.
Yes your sister needs to be honest about the division of assets between the siblings. If you are concerned about her actions you can ask the court to remove her as the personal representative/executor. I would recommend that you seek legal counsel on the steps to remove your sister so that the estate can be divided appropriately between the siblings. I would recommend that you act expeditiously because it is difficult to reverse distributions once completed.
Contact a local attorney that specializes in Probate.
They would likely be able to address your specific concerns/situation and petition the court.
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