if you knoe the DOB of a person, you can find it on microfilms. once found go 7 years each side for siblings DOB.
Once found go to the matrimoni index (Indice) and find the marriage of the parents to children.
the Matrimoni will reflect marriage couple age place of birth occupation along with parents names of both groom and bride along with their age and occupation.
once found go to Motro index (Indice) and find death records.
I have been researching my line since 2003 and have my line out 7 generations and have from addresses today back to c 1750-1770
It takes time
there are genealogy lib. in Concord CA. Santa Monica, San Francisco and all over CA.
or take a vacation to Utah. for initial research of DOB and marriage should take about 5 hours.
it takes time, but resources are available