Petition a sibling

I do not understand as a petition which is rejected is rejected almost automatically, and the petitioner is free to refile almost immediately (in your father's case with a new form). That being said, there is no special visa that would allow your sibling to enter the US and live with you and your sister because of his health reasons. I note that the Trump administration has even taken steps to deny deferred action relief to those seeking to stay for strong medical reasons, and was only forced to temporarily step back by strong adverse publicity. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (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.