My sister was appointed trustee for my dads estate. It has been 9 years and we do not have a final accounting of the estate. What form can I file with the calif court to force a final accountingof the estate? Thanks

Didn't the will go through probate?

my sister was appointed trustee for my dads estate. ...

The term "trustee" suggests that a trust was established, rather than a probate estate. If it was through probate she would be called a "personal representative" or "executrix" (female form of "executor").

Bouncer should try to give us more details, says its an inheritance. Here is a good read for Bouncer too http://www.mmpph.com/pdf/Trustee%20Duties%20Include%20Notifications%20to%20 Beneficiaries%20and%20Others%20-%20MJP.pdf