It was better if you started a new topic.
Looking at the SSDI I found a R. J. Bakker born 20-Nov-1938 who died on April 1992 in Pennsylvania.
Is that your dad ?
Looking online in old Dutch newspapers of 1938 I found a announcement that between 18 and 24 Nov in Steenwijk a Roelof Johan is born , son of Roelof Gerrit Bakker and Johanna Hermina Berendina Drevers.
This is the marriage-record :https://familysearch.org/pal:/MM9.3.1/TH-1-18927-31031-48?cc...
And if the above mentioned family is the right one you can find the family-tree here :http://www.genealogieschinkelhageman.vps7150.xlshosting.net/...