In general, if multiple trusts have similar terms and neither the trust agreement nor state law prohibit merging the trusts, then the trusts can usually be combined into one. Under section 417 of the Uniform Trust Code (UTC) a trustee, after giving notice to the qualified beneficiary, may combine two or more trusts into a single trust, “if the result does not impair rights of any beneficiary or adversely affect achievement of the purposes of the trust.”
The most likely instructions to the custodian would be to "merge" the trusts. However, the trustee should consult with the attorney who set up the trusts to confirm the merger is appropriate and legal.
See also UNIFORM TRUST CODE, page 76.
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