A FAQ example describes the framework rather than deciding a particular relationship. The eligible family categories are a spouse and unmarried children under 21; the official site recommends including those intended to join in the initial application.
Compare the relationship, not the resemblance to the example
An employer may call someone a household dependant for benefits while the immigration relationship requires a separate assessment. Identify the real civil records and intended applicants before using the example to calculate a total. Each eligible joining person adds a nonrefundable US$15,000 processing fee and US$1 million gift, including under corporate sponsorship. These amounts do not expand the eligible relationships or bypass the applicable EB-1 or EB-2 classification, admissibility and visa-availability requirements. A general example cannot promise that all relatives receive a decision together.
Obtain the official birth record and the evidence required to establish the qualifying parent–child relationship; a universal requirement that every certificate name both parents should not be assumed. Cross-chargeability exists in immigrant visa practice, but it is claimed on the record for a legally married spouse who is actually accompanying or following to join, and it is assessed by the deciding officer.