1. My dear it is law and justice , you cannot stop any aggrieved person to appeal, he has the right to appeal. However he cannot file a suit again on the same subject matter – he is barred by law under provisos of civil law – res judicata (Sec- 11 CPC) a matter that has been adjudicated by a competent court and therefore may not be pursued further by the same parties.
Now if you apprehend he may file an appeal , for that you may lodge a caveat so that when the case comes up for hearing no ex parte order is passed until your appearance and until hearing you.