This is in behalf of my cousin. He has been married for 2-3 years and have 2 kids. He was forced to marry his wife since they have a very strong religious family background. Both of his parents are leaders in religious organizations as well as some of his siblings. He was actually on a vacation at the time his marriage was secretly planned by his parents and wife. Only when he went home did he found out and it took less than a week for the marriage to push through. He said he felt he had no choice at that time since all of their relatives already traveled from their respective provinces just to be there. Also, having a strong religious family background, he did not want to shame his family's name. Even after the day of his marriage, he and his wife never consummated their marriage and up until this very day. As per his parents and family, he needed to wed his wife (now) since they already had 2 kids. He both confirmed that the 2 kids were made by accident and made before the marriage. Accident in the sense that in the first child, his girlfriend then and wife now, claimed that at that time, she was not fertile. However, she mentioned after the intercourse, that she was indeed fertile. And on the second kid, he was not of sound mind since he was so drunk and the lady was the one who presented herself as what brief memory he could recall.
He confirmed that before the 2 kids were born, he already broke up with his then girlfriend since he found out that while he was working abroad, she cheated on him. The girl obviously wanted him back that's why she manipulated all those things above mentioned.
The girl now is threatening him that he will never see their children again if he decided to continue with his annulment plans.
With the facts above, what is the best ground for annulment? How and where to begin the process? What is his best chances? How will it legally affect his children? Will they still continue to use their father's last name if in case the annulment is successful? Please your sincerest advice is needed.