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Whether a child can accompany a parent depends on the child's age, marital status and the legal relationship to the principal applicant. A stepchild relationship counts for U.S. immigration purposes only if the marriage creating it took place before the child turned 18. An Oromocto blended family should record marriage dates, birth dates and custody arrangements before assuming everyone can travel together. Hypothetical example: a digital-forensics analyst has a U.S. opportunity, a spouse with Canadian PR only, and a nineteen-year-old stepdaughter. The decision cannot be made from one family label. Check the principal's classification, the spouse's nationality and planned activity, the child's legal relationship, age, marital status, and each passport. Civil records settle family relationships; admission records settle current status; neither document gives a dependent permission that the category withholds.
Establish who is related to the principal, and since when
Hypothetical example: an Oromocto systems analyst with a U.S. TN offer married two years ago; her husband has a daughter from a previous relationship who is now 19 and lives with them. For the daughter to be treated as the analyst's stepchild, the marriage must have occurred before the daughter turned 18, which it did. Assemble the marriage certificate, the daughter's birth certificate showing the father, and the custody or residence arrangement. Without the pre-18 marriage, the daughter would not be a dependant of the analyst at all, and her own status would have to be found elsewhere. Write down whether each dependant intends to work, study, or simply reside. That practical choice may change whether dependent status is suitable or an independent application needs to be considered first.
Apply the age and activity rules to each person
The husband, as a TD spouse, may study but may not work, and his own occupation would need its own route if he wants employment; as a Canadian permanent resident rather than a citizen he also cannot use TN himself. The daughter, as a TD dependant, may attend school but not work, and her dependant eligibility ends at 21, which will arrive during a three-year TN period. Her own citizenship must be checked separately; if she holds a passport that requires a visa, she will need one where the analyst does not. Each family member's own activity and status decides their route. For an older child, calculate age against the relevant date and record any event that changes marital status. Do not rely on a school plan to preserve a status that has an age or family-relationship limit.
Fix the timeline around the dates that cannot move
Two dates control this family: the daughter's 21st birthday and the expiry of the husband's Canadian PR residency obligation if he stays abroad. Plan the TN period and any extensions around the first, and keep evidence of time in Canada for the second. If the analyst later moves to a category that permits permanent residence, the daughter's age would be assessed under the Child Status Protection Act rules at that point, so record the exact dates now. Fees for each dependant's admission or application follow the current G-1055 or Department of State schedule. Prepare translations and name-change records before travel. A mismatch between a passport surname and a birth or marriage record can delay a dependent application even when the underlying relationship is straightforward.
What else is on your mind?
Is a matching job title enough for TN?Can years of experience replace a degree for TN?Can my own U.S. company employ me under TN?Can my spouse work if I hold TN status?Editorial source review: 2026-09-07. General preparation guidance, not an individual assessment.