Estate planning for a California blended family can be a challenging to try to create something that is fair to both spouses and their children. A revocable living trust is one means of accomplishing that goal. This type of revocable trust becomes irrevocable upon the death of one of the spouses. The trust can be altered or revoked during a lifetime, depending on the grantor. After death of one of the spouses, the property is transferred pursuant to the terms of the trust.