If it is worth $27 [up from $7] to know early home address, confirm dob & names of parents, first employer [if not unemployed], signature, you may contact the Social Security Administration: http://ssdi.genealogy.rootsweb.com/cgi-bin/ssdi.cgihttp://ssdi.genealogy.rootsweb.com/cgi-bin/ssdi.cgi
Two local newspapers might search for articles, obits - but 1967 was before computerization in 1985: The [Miami] Herald newspaper http://www.heraldstore.com/research.asp The Sun-Sentinel newspaper, archive service is called "Sun Search".On this web site: http://www.rootsweb.com/~flbrowar/howto.htmlhttp://www.rootsweb.com/~flbrowar/howto.html http://sun-sentinel.com/archive.htmhttp://sun-sentinel.com/archive.htm [Search to locate date, and order copy online, not possible to read whole article, unless visiting the BCLibrary computers.Understand their policy is no-find, no-pay.]
Some 34 years have passed, but possibly one of eleven current phone listings for "Dumas" in Ft Lauderdale could be related.Unusual given names:"Gracia", "Berthiaume".http://www.switchboard.comhttp://www.switchboard.com
Main Branch of Broward County Library --- might be willing to look in old city directories, which sometimes are like mini-censuses, telling names of family members, year when "head" became the widow, occupations:http://www.broward.org/library/http://www.broward.org/library/
Hope this is generally helpful as a starting-point.