Thank you for your help. I found what appears to be his father:

Deceased Klaas Smit , 51 jaar
Father Johannes Smit
Mother Anna Honig
Partner Elisabeth Tijssen
Place Rotterdam
Date of death 12-10-1927
Remarks akte nr. 4219
Source Rotterdam1927e014


And, his mother:

Deceased Elisabeth Tijssen , 62 jaar
Father Klaas Tijssen
Mother IJmske Vellema
Partner Klaas Smit
Place Rotterdam
Date of death 06-05-1935
Source Rotterdam1935b170


Now I would like to find the cemetery they are in. I suspect this will be somewhat harder.