Hi, I hope I can write in English better than your Spanish. I really don't know if this family really existed; maybe they were members of the minor aristocracy and descended from the Dukes of Scleswig-Holstein. But it's for sure they didn't have sovereign or territory authority.
In that case, their notability depends entirely in the particular importance of each member of the family. Its's not a noble house, it's a family like yours and mine, so the article of the pretended house shouldn't exist. So the biography of each of their members depend entirely on what they've don (and they didn't do anything notable) and the reliable sources (which ascend to the amount of zero). Make your own conclusions.
Thank you for calling my atention on those hoaxes. Have a nice week. --Marcelo