Yes - the science was hard... i think some of it was over my pay grade. :)
My father is un-willing to have the test done as he doesn't want to address any discrepancies... it seems I have hit a wall with him. I may never be able to solve the mystery. Oh well. From what I can understand - I believe my results to be accurate. I think that some deceased relatives in the family tree were maybe not totally honest about where they came from. In my case a great grandfather claims to have been from Mexico - but I am not seeing that in my dna. In 1900 they may have had to be dishonest in order to get papers or immigration status or ????
I will plod on and do the best I can.