My Grandfather, Jacobus Antonius KOK, born Rotterdam 11.7.1889, died Rotterdam (?) somewhere in the 1960's. He was the son of Cornelius Jacobus KOK and Louisa Wilhemina SPIESSENS.
That is all the information I can find.
I would very much like to add on to that part of my family. As you can see, I have not much to go on.
Thank you in advance. Barbara