It is often that minor children are included in immigration filings done by one or both of their parents. In such cases, a separate application, often accompanied by a G-28 form, are prepared and properly filed. In many of those instances, a question arises as to who can or must sign the paperwork on behalf of the child.
All applicants 14 years and older must sign their own applications, per 8 CFR 103.2(a)(2). Parents or legal guardians may sign applications on behalf of children under the age of 14.