In fact, during the Edo period the imperial bloodline of the Emperor Higashiyama was adopted by the Tokudaiji Family of the Seiga Family, and therefore the Sumitomo Family was entitled to the status of baron because the fifteenth-generation kichizaemon Tomoito was exchanged to the imperial bloodline of the early-modern history when traced back according to the male line.
実はこの清華家の徳大寺家は江戸時代に東山天皇の皇胤が養子に入っており、15代目吉左衛門友純をもって住友男爵家は、男系でたどれば近世の天皇の皇胤系に入れ替わった。