My son is a teen and he is a permanent resident like myself. Can I apply for citizenship for both of us at the same time? Are there any restrictions?

The Child Citizenship Act (CCA) of 2000 states that if a Permanent Resident becomes a US Citizen, any child who is also a Permanent Resident and is under 18 years of age at the time the parent naturalizes, that child automatically becomes a US Citizen. You can then file form N-600 to apply for a Certificate of Citizenship for your child or apply to the State Department for his passport.