Calculating the exact percentage of Native American ancestry can be challenging and depends on various factors such as the specific tribe, intermarriage, and generations passed since your great-grandfather's mother. Additionally, the concept of "blood quantum" or percentage of Native American ancestry varies among different tribes and is not universally recognized or used.
That being said, let's look at a general estimation based on the information provided. Since your great-grandfather's mother is fully Native American, we can assume that your great-grandfather would have received half of his genetic makeup from her. This means that your great-grandfather would be 50% Native American.
Assuming that all subsequent generations maintained a consistent 50% Native American ancestry:
- Your grandfather (child of your great-grandfather) would also be 50% Native American.
- Your parent (child of your grandfather) would be 25% Native American.
- You would inherit 12.5% Native American ancestry from your parent.
Keep in mind that these calculations are a rough estimation and might not accurately represent your actual genetic makeup. Ancestry is a complex blend of genetic material from both parents, and the inheritance of specific traits can vary widely between individuals.
If you are interested in learning more about your family's heritage and genetic background, you can consider taking a DNA test from a reputable provider. These tests can provide more detailed information about your genetic ancestry, including potential Native American heritage, although they might not be able to identify specific tribal affiliations.