September 27, 1906. The Marquise de Fontenoy reports that Count Taveggi, who has lives in the USA as he is married to "the daughter of rich people of Jersey City, Mr and Mrs. Clement Heltenmeyer" is mourning the death of his grandmother, Princess Friederike of Hohenzollern. The princess died on September 7th. In 1844, the princess married her cousin, the Marchese Pepoli, whose mother, Laetitia Murat, was the daughter of the King of Naples.
The Princess and her husband had thre daughters, Laetizia, Antoinetta and Luisa Napoleona. In 1872, Antoinetta married Count Carlo Taveggi, and were the parents of two children, Frederica (Frida) and Giaoacchin (Joachim).
Frederica married back into the German nobility when she wed Baron Clement Geyr von Schweppenburg. Joachim headed to America, "where he underwent many hardships before finally leading to the altar an American heiress," Elfriede Heltenmeyer,
Count Taveggi and his wife reside in Jersey City with their two young children, Antoinetta and Clemente.
In 1910, Elfriede inherited a third of her father's multi-million fortune. Theodore Heltenmeyer was a major leather goods mamufacturer in Hoboken, New Jersey. Count Joachim was "expected to assume active management of the German branch" of his late father-in-law's business. The Taveggis planned to make their principal home in Kripp, on the Rhine River.
I do not have information on Joachim and Elfriede's descendants or if the family remained in Germany. The last reference to the family was in October 1921, when Countess A. Taveggi sailed on the George Washington for Bremen via Cherbourg. I am going to guess that the A. Taveggi was Joachim's daughter, Antoinetta.