A spouse and unmarried children under twenty-one may generally be included as derivatives. Adult sons and daughters are not derivatives and their jobs do not count, but another relative such as a brother-in-law is not excluded merely by kinship and may count if otherwise a qualifying U.S. worker.
Two different questions that families often merge
Being part of the family business and being part of the immigration filing are separate matters, and it is worth writing them in separate columns. Derivative status covers a spouse and unmarried children under twenty-one, with the age analysis being technical enough that any child near the limit should be raised with counsel early. The investor, spouse, sons and daughters are excluded from the qualifying job count.
Other relatives, including in-laws, are not excluded solely because of the relationship and may count if they otherwise meet the definition of a qualifying U.S. worker. Their own immigration route, if needed, remains a separate question.
The staffing plan should identify each worker's basis clearly instead of treating all relatives alike. Hypothetical example: Sunita is considering an immigrant-investor filing with her spouse and a twenty-year-old child who expects to begin graduate school soon. A first family review should put every passport, birth record, marriage record and age-sensitive date into one timeline, then identify whether the child must be included before a threshold is reached.
The civil records, not a family summary, settle relationship and age. Sequence the family analysis before filing strategy, because an apparently small delay can alter who may immigrate with the principal. Mistakes occur when parents focus entirely on the investment and discover too late that a child's eligibility depends on timing rules separate from the business.