Anyone into Genealgy ?

I only found my Grandfather and his brother on my father side on Find a grave. Their father (my great grandfather) died in San Fransisco in 1933 according to my Great grandmothers citizenship paper. I have no clue what he was doing in Ca. and cant find anything about his other then paper work from her and a census from 1920. Its killing me because he's the one i wanted info on so I could figure out the true story about our last name.