It is understood that Tony is his co-trustee.

不言而喻，托尼也是他的托管人。

youdao

Moreover, you may want to appoint an independent co-trustee in addition to Mom.

FORBES: Death, Taxes and Dice Rolling

One of the SLATs could have a third person act as co-trustee with the beneficiary spouse.

FORBES: Spousal Lifetime Access Trusts--Use Your Gift Tax Exemption Without Giving It All Away

Henry created a self-settled Delaware Domestic Asset Protection Trust (DAPT) for himself, with BNY Mellon as a Trustee and his lawyer as a co-Trustee.

FORBES: As An Asset Protection Trust, Henry's Trust Was A Notable Failure