I didn't find their obituaries but below is a transcript of what appears to be the 1917 death notice of a son. If all else fails, you can send for the son's death cert which will likely show his place of burial, an interment record of that plot may show that his parents are there as well.
Buffalo Evening News Saturday,April 28, 1917; page 2 KUNHKE -In this city April 28, 1917, William E., beloved son of Henry and Louisa (nee Gentes) and brother of Henry and Louisa B. Kunhke; aged 27 years 10 months 13 days. Funeral from the family residence, No. 277 Stanton street, Tuesday at 2 o'clock and from Salem church on Sherman street at 2:30 o'clock. Friends invited to attend.