please can a lawyer advise me what to do

after my devorce case with my wife, our kids were seperated, i got custody of my son and moved on with life, it was sad that the kids were seperated but it ended that way, i have been working had to make sure my son have a good life, put him in a new school and give him all he needs, sudenly i have been asked to appear in court again, my ex-wife filed another suit stating he wants the kid to be taken care by her parents because i refuse to allow her take him to see them, i did refuse her to do so because her parents have done series of things to bring me down to zero but God on my side all their plans failed, i just realized the judge for this case is the same judge who presided over our devorce case.he tried to be one sided but he couldn't bend the law, now my exwifes case is based on

1. the enviroment in which my kid is is not good for the growth of the child in china

2. i refuse her to make my son stay with her parents for sometime.

so what do i do next, because it was ur advice that made me win the devroce case.

can i request a change of the judge?thanks for reading

Hmmm, you refuse to let the children see their grandparents because they "have done series of things to bring [you] down to zero ". So you decided to punish them in the most effective way possible even though "God on [your] side all their plans failed". Why do you use your child to punish the grandparents for failed schemes? Or at all, for that matter? Access is the right of the child to see their parents/grandparents. Who are you to say whether or not your son should see his grandparents? You have said nothing to suggest that they they would cause harm to your son. The impression I have is of a vindictive person who is prepared to use his son to punish someone for plans that didn't work. I used to be a divorce lawyer years ago, but quit because it pained me so much to see parents using children as bargaining tools and instruments of punishment. If I were the judge I would give you pretty short shrift. But now to practical matters: your wife's application may well be borne out of frustration at your attitude. Perhaps it is just a way of making you see sense. Unless there are genuine and well-substantiated reasons to show that seeing his grandparents would be harmful to your son, you should just draw a line under the past and allow it to happen. And don't see this a a question of "face". "Face" doesn't come into it when it comes to the welfare of children.