On the website of lunoveleup, Pierre Louis Charles DESTEMBERT is recorded as the last of the de Stembert family. Which is not fact. Though, my family took on the name de Stembert dit Clignet, and later went by Clignet/Clignett doesn't mean there aren't any descendants left of the original de Stembert family. René Stembert is not related to the original de Stembert family. Looking at his family coat of arms, René Stembert is most likely related to the STERNBERG family.
Jean Remacle Destembert
Jean Remacle de Stembert, FAMILYNAME: REMACLE from/of STEMBERT, BE