Hello there! My father started filing for me and my 2 sisters so we can move from Jamaica to the US back in March 2020, however, he received only one letter in the mail stating that one of my sisters were approved. It is almost 4 years now, and I am a little worried that our father will not get me and my other sister’s approval letter. So I'd like to ask, will there be any problem with our filing? Is it possible that he could get the next two approval mail later on? They haven't asked for anything else. I understand that for us the process will take years because we are all over the age of 21 and unmarried. My sister who got approved hasn't received any notification to get the documents together for an interview, yet though.