Derivative eligibility is assessed under the family and individual rules, not by inventing another principal role. Eligible accompanying derivatives need no additional principal investment merely to join.
Separate the investor’s participation from family eligibility
A qualifying spouse and unmarried child under 21 may be eligible, subject to applicable CSPA analysis and visa availability. Do not create fictional work duties merely to explain the household’s residence plan.
Age is measured at a statutory moment rather than at filing, and the Child Status Protection Act can subtract certain periods from a child's age in defined circumstances, which sometimes preserves eligibility for someone who passes twenty-one during processing. Where a child is within a few years of twenty-one, the age calculation should be obtained early and revisited whenever the plan slips, because a postponement made for ordinary business reasons can quietly change a family member's outcome. What a family can control is sequencing and record-keeping: knowing every child's exact age at each stage, avoiding unnecessary delay in filing, and being ready to prepare an independent route for an older child rather than discovering the need late. Civil documents are frequently the slowest items to obtain, particularly where a registration must be requested from another country, and age-related eligibility questions for a child should be raised with counsel early rather than discovered when the rest of the file is ready.