I had a little google and I think kiang's information comes from a site where someone is mixing up their dates and names.
The information is quite similar to what is on (for example) Zooborns' article about Elloras' 2013 birth of Kiran, where it has sentences like "At Zoo Basel in Switzerland, an Indian Rhinoceros gave birth during the night on October 5", and "Kiran's 3-year-old sister, Henna, was also present for the birth. This was the first time in a European zoo that a Rhinoceros birth has taken place in the presence of an older sibling, as it occurs in nature."