My cousin, Facundo "Ding" Roco, brother of the late Senator Raul Roco, is our preeminent historian. He and my older cousins seriously started working on the family tree as early as 1978. It was a crude beginning, with many unlinked families and incorrect leads, and some floating theory of where we all came from (3 Italian brothers who sailed to the Philippines). However, in 1979 (or thereabouts), a relative sent us a photocopy of a manuscript written in Spanish (http://home.att.net/~ca-roco5/manuscript_toc.htm - with the translations on http://home.att.net/~ca-roco5/rocohist.htm).

The Roco family tree. Click to download view bigger version.
That is where we now stand, and how we ask relatives which second-generation lineage they come from. In 1995, Ding converted all these info into a family tree with the aid of a software. In 1997, I got hold of a copy of this database, and transformed this into a website. Since then, we've gotten so many inquiries from relatives all over the world. Ding came out with a most recent update on the our history in http://home.att.net/~ca-roco5/latest.htm.
One of the "new" relatives I've gotten to know is Jack Joseph de Roco, who grew up in Cerritos, Ca., but has since retired in Brazil. He in turn gave us a lot of insight into a branch of second-generation Rocos (de Roco): Don Jose Simon de Roco, who sailed back to Barcelona to study, along with another brother. He then sailed to Mexico, and then upwards to California and there, he had his whole set of families! (http://home.att.net/~ca-roco5/hist_jose_simon.htm)
© Carlos Roco