I believe Jacob was my Great Uncle if I am correct he was one of 8 born to David Kops b.1860 and Marianne (Van Collem)b.1853 who around 1900 came over to the East End of London UK to live. Also he was related to Marcus van Kleef b.1851? and Sara Kops b.1857? Would like to contact anyone who has any info. please ,