I get my Green card under the F11 category, one of my Accompany (Son) is in "follow to join" status, Ca i get Married if i already get my Green Card?

The Foreign Affairs Manual in addressing the issue of the basis of following to join states the following that may make it difficult for your son to follow if you change your category at this point. “There is no statutory period during which the following-to-join applicant must apply for a visa and seek admission into the United States.  However, if the principal has died or lost status, or the relationship between the principal and derivative has been terminated, there is no longer a basis to following to join.  As an example, a person would no longer qualify as a child following to join upon reaching the age of 21 years (unless they qualify for the benefits of the Child Status Protection Act, see 9 FAM 502.1-1(D) below) or by entering a marriage.” Hope this helps. Due to the limitations of the Lawyers.com Forums, Alan Lee & Arthur Lee, Esqs.’ (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.