Obtain the spouse’s and son’s identity records, travel and immigration histories, and confirmations of their answers. A 19-year-old must still be unmarried and meet the qualifying-child relationship requirements. Check age protection if relevant to a pending case; a birthday alone does not tell you whether a specific older child can qualify.
Collecting histories from three people at once
Give each person their own questionnaire and their own deadline, and have each confirm their answers in writing. Their eligibility to join derives from the principal, but admissibility is assessed for each individual, and a fact one person discloses can matter for the file as a whole. Including family at the outset is what the program recommends for its benefits; later addition is not free and is not simply impossible, so decide deliberately.
The FAQ describes an eligible spouse and unmarried children under 21, with intended joining relatives included initially. The published terms extend the Gold Card to a spouse and to unmarried children under 21, each with a separate gift and processing fee. Review a child’s unmarried status, age under 21, and any CSPA issue individually.
A child of 18, 19 or 20 is still within the under-21 range, so 'adult' in ordinary speech is not the test.