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The Eligibility requirements (PDF file) from this page states:
- In regard to (1), if a single copy of your Overseas Residential Registration verifies that any family members living with you in the country have stayed for 10 consecutive years or more, such a document is valid for those family members.
- Concerning children (under 12 years of age) whose stay in the country is less than 10 years at the time of purchase of an Exchange Order, if a single copy of the Overseas Residential Registration stated in (1) verifies that they live together with the applicant whose stay in the country is 10 consecutive years or more, and if they also use the JAPAN RAIL PASS together with that applicant, their eligibility requirements are satisfied.
There may be other allowances listed in this document, but this one seemed like it may be relevant to you.