Trying to Find the Parents of Peter and Willow Duncan Case

My Great Grandfather Peter or it may of been Peete CASE Married Willow DUNCAN Possibly on Oct 28th 1924 I have no Idea when they were born or when they died I believe that they died in California but I do not know if they are buried there. They had Five children Mary,Marvin, Melvin James and two others that are still living.