A: There is not a clear answer to this question. It would be necessary to review the Power of Attorney document to see if it grants to the agent the power to make such a gift. It would also be necessary to evaluate whether or not this transfer was in the interest of the parents (such as for estate planning purposes) by reviewing their overall financial situation, other estate plan documents they had created and other information. It may be that this action was a breach of fiduciary duty but that cannot be determined without more information.
A: The executrix stands as your deceased father's personal representative so she can decide who can enter the property. The rest of the beneficiaries have a beneficial interest. If you believe the estate is not being administered properly or the property is not being maintained, you can file a petition in the Orphans Court in the county in which the estate was opened to seek an order for access, for an accounting of the estate, or even to have your sister removed from her position with the Court appointing a new personal representative. It would be helpful for you to consult with a local attorney who has experience in this area.
A: If your father was a resident of Pennsylvania and did not have a will, the Pennsylvania intestate succession law would apply. In a situation where the deceased was married and one or more of his children was not also the child of the spouse, then the spouse's share would be one-half of the intestate estate. This refers to assets which your father owned by himself which do not have a beneficiary designation. Assets which he owned jointly with his wife or someone else with survivorship would go to the surviving joint owner outside the estate. Assets which have a beneficiary designation pass outside the estate and go to whomever is designated as beneficiary.