History /
Anyone know the name, if true... .... Polish Royal heir [40]
If you are wanting to look into whether or not you have royal blood (let's just go along with this for a second everyone and put aside factual history, shall we? :) ), the only way that it would work would be for you to first trace back YOUR family history. Get your family members names, dates of birth and passing, places of birth and residence, etc. Trace back your own family line. THEN, after you for sure have concrete evidence of your family geneology tracing back to this controversial 4th generation member, you can proceed to trace their family geneology back a couple more generations. Then, learn Polish history to see whether or not this is remotely possible. If it's not possible, well, bonus you still actually learned your family history.
The only two names associated that I know of "spelling is NOT correct" are Swikoskie and Grotchec.
Swikoski could be Swiecicki, Suszycki, Sukowski, etc. As far as I recall, none are "royal" names.
Grotchec could be Grotchev (which I believe is Bulgarian).
Point being, until you know for sure with hard concrete evidence, you said you are a policeman so of course you know this, there is no case to go on.
Also, illegitamite children of nobility and royalty technically are not considered that because they are illegitamite and unacknowledged by the nobility and royalty, irregardless of what country we are talking about. There is the possibility that there is a tie that way, I mean, the nobles and royal family used women of lower social stature for their pleasures and didn't care if a child was produced from it. In fact, sometimes the pregnant serf would be killed or banished.