Question: What is the date of birth of Sönke Rothenberger's mother?
Sentence (from "Gonnelien Rothenberger"): Gonnelien Rothenberger (born June 5, 1969 in Weert, Limburg) is an equestrian from the Netherlands, who was born as Gonneke Antoinette Arnolda Johanna Adriana Robertine Gordijn.
Relevant evidence: Yes