Alexander] to their accountings establish that legal advice sought in that regard is ‘defensive’ and therefore personal to themselves and privileged.” In doing so, the court explained that “responding to questions and objections by beneficiaries regarding a fiduciary’s accountings is at the very core of trust administration. And . . . if [appellants] did not see that work as part of the Trust’s administration at the time, surely they would have done something to protect the privilege, as would any prudent fiduciary who felt the need to be ‘defensive.’ ” Yet then, affording appellants “every benefit of the doubt . . . which will allow [them] to withhold those documents which they now identify as protecting them from personal liability, specifically, the petitions for surcharge and/or removal,” [italics added] the court upheld the privilege as to 45 documents on the supplemental privilege log, while ordering them to deliver the balance of the documents to FTI by March 5, 2015. Following a hearing, the probate court’s tentative ruling became a final order, after which both parties filed timely notices of appeal. DISCUSSION Both parties appeal portions of the probate court’s order permitting appellants to withhold some, but not all, trust records claimed as privileged on the supplemental privilege log. Appellants, for their part, challenge as error the probate court’s ruling to sustain FTI’s and Alexander’s objections as to all but 45 documents on the supplemental privilege log (hereinafter, Privilege-Denied Documents). FTI and Alexander, in turn, challenge as error the probate court’s ruling to uphold the privilege with respect to those 45 documents on the log (hereinafter, Privilege-Upheld Documents). The legal framework for resolving this dispute is, for the most part, not in dispute. “A trial court’s determination of a motion to compel discovery is reviewed for abuse of discretion. [Citation.] An abuse of discretion is shown when the trial court applies the wrong legal standard. [Citation.] However, when the facts asserted in support of and in opposition to the motion are in conflict, the trial court’s factual findings will be upheld if they are supported by substantial evidence. [Citations.]” (Costco Wholesale
[Italics added.] A trust is a fiduciary relationship with respect to property in which the person holding legal title to the property — the trustee — has an equitable obligation to manage the property for the benefit of another — the beneficiary. [Citations.] A trustee must always act solely in the beneficiaries’ interest. (§ 16002, subd. (a); [citation].) If the trustee violates any duty owed to the beneficiaries, the trustee is liable for breach of trust. (§ 16400.) . . . In a trust relationship, then, the benefits belong to the beneficiaries and the burdens to the trustee. The office of trustee is thus by nature an onerous one, and the proper discharge of its duties necessitates great circumspection. Liability to beneficiaries for mismanagement of trust assets is merely one of the burdens professional trustees take on — for, presumably, an appropriate fee.” (Moeller, supra, 16 Cal.4th at pp. 1133-1134.) Thus, because it is clear on this record the probate court failed to consistently and appropriately apply the legal standards prescribed by the California Supreme Court in Moeller and Costco, an abuse of discretion has occurred. (Costco, supra, 47 Cal.4th at p. 733 [“An abuse of discretion is shown when the trial court applies the wrong legal standard”].) Moreover, we agree with FTI and Alexander that the supplemental privilege log, as it stands, provides insufficient details regarding the underlying documents to permit us to conclude on this record that appellants made the requisite preliminary factual showing to support their privilege claims with respect to the Privilege-Upheld Documents. Thus, insofar as the challenged order upheld the privilege with respect to those documents, the order must be reversed and the matter remanded for reconsideration under the correct standard. Because the limited description provided with respect to the Privilege-Denied Documents was sufficient to confirm that these documents were exchanged in connection with trust administration and not with the trustees in their personal capacities (see footnote 5, ante), the challenged order is affirmed with respect to those documents.