Yes, but under the current official FAQ a spouse and each unmarried child under 21 must be included in the initial application, and each included family member requires an additional $15,000 DHS processing fee and $1 million gift. Re-verify those terms on the official page before any payment.
Read the family terms; treaty nationality is not the issue here
Hypothetical example: the physician is a Canadian citizen and her husband holds Canadian permanent residence and a passport from another country. Unlike TN or E-2, the Gold Card does not turn on Canadian citizenship, so the husband's nationality is not a barrier in itself. Under the current official FAQ, a spouse and each unmarried child under 21 may join if included in the initial application, and each included family member requires an additional $15,000 DHS processing fee and $1 million gift.
The couple's adult children do not fit those family terms. Confirm each person's citizenship, age and civil status with documents, and keep a dated copy of the FAQ. Because the official framework may change, re-verify the family charges and the EB-1 or EB-2 process before filing or moving money.
Family review should collect a separate record for every person: passport, birth or marriage evidence, name changes, citizenship, age, and the particular status sought. A relationship alone does not answer all of those questions. Hypothetical example: an archival-film restorer plans to include a spouse whose passport contains a shortened name and a nineteen-year-old child born abroad.
The reviewer obtains the marriage record, full birth record, and name-link evidence before making assumptions about eligibility. Resolving those details early is more efficient than trying to reconstruct them after a payment or travel plan is fixed.