The advise of an experienced EB-5 attorney will assist you in the answers to your questions. The question that needs to be answered is what is the exact age of the child. For instance, is the child under 18 years of age ? When will the marriage take place ? When will the I-526 petition be filed ? Where were you born, China? If China, then children who are close to being 21 years old just before the I-526 petition is filed may age out and not be able to apply for conditional residency.