History /
Royal Family still in Poland? [79]
23 generations is a long long time (there are about 80 generations between people today and people alive at the time of Jesus). People of high status in Europe who were alive then have an awful lot of descendants of all nationalities, skin colours, socio-economic backgrounds, whatever.
One thing about claiming royal descent from Polish monarchs (I do myself, by the way as well as from royalty in several other countries including England and Scotland) is that there were several royal houses over the centuries, meaning several royal families and none of them with any sort of legal status today.
Another thing is the reliability or otherwise of family legends.
Nevertheless, there's a very strong chance that your grandfather's story has some basis in truth. That means nothing today in an official sense, and certainly doesn't mean that either of us are royal. It just means we have a nice story to tell and you should be grateful to your grandfather and other forebears and happy that the story has been passed down by them through the generations.