Get an affidavit done by your parents.
A sample format.
AFFIDAVIT
We, Fathers Full name and Mothers full name " (Maiden Name) being duly sworn, hereby affirm and state:
1. We reside at "full address including country name".
2. "Father's First Last Name" was born in "City, State, Country," on "Day Month Year".
3. "Mother's First Last Name" was born in "City, State, Country," on "Day Month Year".
4. We have been married since "Day Month Year".
5. "Name of the person for whom this affidavit is being made" is our "son/daughter" who was born on "Day Month Year" in "City, State, Country".
So we do hereby solemnly affirm the foregoing are true and correct statements.
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"Father's Full Name"
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"Mother's Full Name"