If you don’t mind, could you provide if a letter from my relative(s) is enough, or an email is enough, or some other form of confirmation is needed (for example, my parents are ready to send another signed letter now, with two witnesses signatures on that letter, for that $9000. Same is true with my sister also for that $1000 and she is ready to send whatever letter or email is needed). Also, what should be the content of such letter or email or document (the donor’s name, address in Taiwan, age, relationship to me, how much cash the donor gave/sent to me, and when he/she sent, is enough?). I am so concerned. I want to get all necessary documents and put this behind, and fully focus on my studies.