Start by getting dates of birth and death of the one's you already mentioned. The oldest surviving census of PR that was done by the US gov't in the 1910. Look at this page: http://www.rootsweb.com/~prsanjua/censo17.htm#60http://www.rootsweb.com/~prsanjua/censo17.htm#60 part is already transcribed for Quebradillas. If you know what barrio those who lived in 1910 were from you can purchase a copy of the census images and search other information. If you need info prior to 1910 you will need to search vital records via familysearch.org and get access to the Latter Day Saints database.