Question: Who is George Valentin Bibescu's maternal grandmother?
Sentence (from "Valentine de Riquet de Caraman-Chimay"): she gained custody of her two children and later the same year married Georges Bibescu, son of Gheorghe Bibescu, with whom she had three more children - Georges, Nadège (princess Stirbey) and Georges-Valentin (1880-1941).
Relevant evidence: No