Community property applies in a divorce, but that is not what is happening here. If he is not named as a beneficiary in the trust, then he does not get anything. And if he is named as a beneficiary of the trust, he only gets what the trust says he is supposed to get.
And now FOR A LEGALLY ACCURATE ANSWER!!! (Shades of JetX):
If the decedent was married, the first question is whether the decedent owned community property, separate property, or a combination of the two. Community property is generally defined as the assets acquired during marriage from earnings or salary. Separate property is generally defined as assets brought into the marriage when the decedent got married, inheritances to the decedent, or gifts to the decedent. However, California case law provides many exceptions to these definitions, and assets can change from community to separate property, or from separate to community, by combining assets, by improving separate property with community property, or by written agreement of the spouses, for example.
1. The decedent's community property goes to the surviving spouse, who may have to file a spousal property petition to establish ownership.
2. The decedent's separate property is distributed as follows:
a. The surviving spouse receives all of the separate property if the decedent is not survived by issue, parents, brothers, sisters, or children of a deceased brother or sister.
b. The surviving spouse receives one-half of the separate property if the decedent had only one child, or issue of a deceased child.
c. The surviving spouse receives one-half of the separate property if the decedent left no issue, but left parent(s) or their issue.
d. The surviving spouse receives only one-third of the separate property if the decedent left more than one child.
e. The surviving spouse receives only one-third of the separate property if the decedent left one child and the issue of one or more deceased children.
f. The surviving spouse receives only one-third of the separate property if the decedent left the issue of two or more deceased children.
(I found this on a CA lawyer's site.)