Looking for my father in law? ?

I was recently doing a genealogy tree with my son and my side of the family goes back all the way to the late 1700's. But my husband never lived with his father. He used to have communication through my husbands step-father but the step father got sick and they lost all communication. His last name is Sequeira and he should live in the California area. He is originally from Nicaragua. I know there is not much info but if anyone thinks they might know him please answer. Thanks!!