http://vitals.rootsweb.com/ca/birth/search.cgihttp://vitals.rootsweb.com/ca/birth/search.cgi has 11 PROCK individuals born in Stanislaus County. I didn't look there for children born in Stanislaus County whose mother's maiden name was PROCK, but you could. None of them were the children of Albert and Josephine, but they might be grand children.
http://wp.superpages.com/people.phtml?SRC=http://wp.superpages.com/people.phtml?SRC= has 5 listings if you use PROCK as a surname, MODESTO as a city and check the box labeled "Include nearby areas". Modesto is the county seat and largest city in Stanislaus County. Turlock, Denair and Hickman are small towns in the county.