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Absent bringing a law suit to see your son's daughter, you do not have automatic rights to see your son's daughter. http://www.courts.ca.gov/17976.htm. The Supreme Court case Troxel vs. Granville set out a standard that grandparents have no legal enforceable right to see their grandchildren unless they proceed through the court system and are awarded such through the courts. California must abide by the Supreme Court decision.
Because your daughter and son in law are married you cannot bring a suit to get visitation with your daughter's child, unless one or more of the following conditions are met:
Regarding your son's child, you could file for visitation, but you would need to prove and manage the following:
It is possible that this may be something that can be worked out without going to court, but the above would be your legal recourse if you did decide to pursue visitation with your son's daughter.