You might be able to find Rudolph's birth certificate at the Bon Homme County Register of Deeds, http://doh.sd.gov/vitalrecords/County/BonHomme.aspx
. Birth certificates weren't required by the state until 1905 but the county might have it if one was created.
I didn't find the Hirsch family in the Census records.
I did find the Hinke family Alberta Canada family tree, http://trees.ancestry.com/tree/11780916/person/-394575445
. That tree said the family moved to Alberta in 1903 so I didn't do any further searching in the U. S. for family members. Successful Searching!