You first need ascertain the status of the allotment. Most allotments are governed by the tribal governing authority. Contact the BIA and request a Tribal Status Report with the property description to determine the present status. You may need to probate the estate to enforce the will. You may need to start an action to enforce your property rights. Tribal property disputes are extremely complicated and require a highly skilled attorney. These disputes can be expensive
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There are a surprising number of attorneys in California who are experienced in Native American law: http://www.avvo.com/search/lawyer_search?utf8=✓&q=native+peoples+law&loc=California&commit=Find+lawyers
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If the tribal government will not provide you with a list of allottees and tribal land ownership, then you may try the Office of Special Trustee to get the Individual Trust Interest report. If your grandfather owned an interest in allotted land, this report will confirm the information. A good starting point would be the Fiduciary Trust Officer at the Office of Special Trustee at the Pacific Region Office in Sacramento. They may be curious as to why your grandfather's will was never probated if it wasn't.