You can file for your unmarried son (over age 21) and/or your unmarried son (under 21) now, but would need to be a citizen before sponsoring a married son or daughter. If you sponsor your 15 year old, it will still take some years before your child can immigrate, and you may wish to explore other options for nonimmigrant visas in the meantime.
Best to look into that strategy with an experienced immigration attorney.
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I agree with my colleague
Samuel Ouya Maina, Esq. 415.391.6612 email@example.com Law Offices of S. Ouya Maina, PC 332 Pine Street, Suite 707 San Francisco, CA 94104
Yes. The sooner the better. Your son can apply for his brother. In some cases, multiple filings are recommended.
This response is general in nature and cannot be construed as legal advice, given that not enough facts are known. Any comments offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship. If you would like additional information based on this response, please contact my office at 510 657 7665 or 415 902 0832 to schedule a consultation.