Im a geneologist from Sweden and have been looking into your request for knowledge about your family. You may be intrigued to find out that the name Powis actually derives from the Ancient Greek word for Power. Power was the god of human strength. It is commonly known that Power was a womaniser and fathered many children all over the world, including the Carribean.
I hope this explains some of your questions about your family. Good luck with your quest.