Obtaining US citizenship through parents is possible if certain criteria are met. Children must be under 18 years of age and have at least one parent as a U.S. citizen by birth or naturalization.

Eligibility Requirements:

• Must be under 18 years old.
• Have at least one US citizen parent (including adoptive).
• The father must meet physical presence requirements in the US.
• The child must be under the legal and physical guardianship of the parent who holds United States citizenship.

Procedure:

• Download and complete Form N-400, application for naturalization.
• Attend the biometric data appointment.
• Carry out English language and civic knowledge assessments.
• Attend the celebration of the commitment of fidelity.

Children of US military personnel who reside outside the country can complete the entire process from abroad.

Source: View Source