I sponsored my parents for their 12 month B2 multiple re-entry visas last August. Ever since then, our relationship was largely estranged. The situation got so complicated that it would be the best that they do not visit US any time soon.
Would it be possible if I ban the visas before them due this August? Would a restrain order work in this situation please? What are my choices in preventing them being in US please?
Thank you so much for your help!

