Legal Question in Wills and Trusts in California

Waiver of bond is different from waiver of accounting. You will probably get a request from him to sign a waiver of accounting as well, when it is close to settling the probate. Up to judge to decide, but usually yes, you need consent from all beneficiaries, for waiver of bond.

No, it's waiving the requirement for him to carry a bond--the bond would pay the beneficiaries for any losses due to your brother's taking the estate money or losing it, and is an expense of the estate. If you have your doubts about him, you may not want to waive the requirement--I've seen bonds pay out, including into the millions of dollars, so it can be money well spent.

Separately, he will have to provide an accounting to show what assets were and are in the estate, the income of the estate and the expenses of the estate. You can waive this separately, usually toward the end of the probate process, but you certainly don't have to.

For the bond and the accounting, all beneficiaries would usually have to consent to waive it, so if your sister is holding out, he'll likely have to get the bond and do the accounting, and both protect you.