My father was petitioned by my grandmother 15 years ago. Until today, we are still waiting for his petition to be approved. He has attempted several times to come to the United States to visit me and my husband, but his visa application is always denied. They immigration's major reason is for him to wait for his petition from my grandma to be approved.
Since I will be applying for my citizenship in few years from now, should my father withdraw his petition from his mother and wait for me (as her daughter) to sponsor for him to come to America? I think it would take many years if we would wait for his mother's petition.
I hope someone can give me an advice about this situation. If my grandmother should withdraw her petition for my father, what are the steps to process this? Hope anyone here could help me! Thank you!