Let's assume I have been given spiritual gifts and powers through bloodlines, how do I determine what part of my family gave me my spiritual powers and form? Also, how do I determine who does and does not have spiritual blood in them?

Mm you can do a reading or ask professional readers who offer such services. You can also track your parents' lineage or DNA ancestry from some companies e.g. AncestryDNA. If you have ancestor spirits, you can ask them as well : )