My grandmother was full blooded Lenni Lenape Indian and my dad half. All my cousins are Lenni Lenape. Growing up Indian (Native American) is an interesting experience. My mom was German, so it was an interesting mixture.
My family has been in America since before the start of the US so I'm a mix of about everything but black and Asian. Before she died my grandma was big into geniology, I even went with her to new York city to a courthouse to look at old census records on microfilm. We traced our family back to early 1700's orange county new york. We know there were marriages to natives but we don't know the tribes, it was a bit of a taboo thing at that time to marry a native woman.
Only if you can believe what's been passed down on my mother's side of the family. I'd like to do one of those DNA tests to see if there's any truth to it, but if it is, it would be a pretty small amount of Native blood.