How can dependents submit biometrics separately from the principal applicant for the Maltese Residency and Visa Program?

I am the principal applicant for the Maltese Residency and Visa Program. My wife and my 16-year-old son are my dependents. My son is attending a high school in the U.S. while my wife and I are living in India. We might not be able to travel together to Malta for the biometrics. I am wondering if we can take biometrics separately and if so, do I have to take it first?