I want to point out that there are multiple threads ("conversations") that appears to be about the Estrada family that contained notable landholders in the early days of California's statehood. Those threads (that I've found) are:
http://boards.ancestry.com/surnames.estrada/2/mb.ashxhttp://boards.ancestry.com/surnames.estrada/190/mb.ashxhttp://boards.ancestry.com/surnames.estrada/363/mb.ashx