Did your attorney tell you why you should serve him before he goes? If not, ask him why. Do you not trust your attorney? Otherwise, I don't understand why you're not willing to do as he suggests.
Perhaps you're trying to save money by having your cousin serve him. Divorce is highly emotional. I suggest you need to make your divorce be as factual as you can.
Why are you wanting the cousin to explain anything to your husband? Doing so increases his anger. I read your previous posts. Your husband is abusive. Makes no sense to stir up emotion. You posted about getting a divorce a year ago and didn't follow through. He know why you want a divorce. What do you want your cousin to tell him? I wonder if you're trying to reduce the possibility of him verbally or physically abusing you. Perhaps you want to in affect apologize. If so, you're still trying to not upset him. He will be upset no matter how he's served. And you're telling him he still controls you.
There is no way you can make this better. Divorce is painful. I suggest you let this divorce be about you and your
Kids. Expecting his cooperation makes no sense.
I hope that you've planned how you can live without his financial support. You already know from your experience a year ago that he's going to contest financial arrangements. He isn't going to change. You've tried for 20 years to change his treatment of you. You know who he is and what he will do.
You cannot control whether he stays in Mexico or not. In reality, if you serve him now, you've started the court process. If you don't serve him now and he remains in Mexico, he"s been served. You can't serve him in Mexico.
You cannot control what he does financially The papers may say he's to pay a certain amount. Divorce papers are telling him what you and your attorney expect him to do. He doesn't have to comply. If he doesn't provide financial support you'll have to contest that in court. What does your attorney say can happen if he stays.
I suggest you're overthinking this. The reason to have an attorney is help you through the divorce. He also us a buffer between you and your husband. Let him do his job.
Wait, are you trying to save money by only consulting with him? If so, your divorce will be more expensive. You need him to represent you, to make this process work for you. You know your husband is not going to just accept a divorce, divide marital property and child support. You will need your ongoing legal support. It will be expensive either way. If you let the attorney handle this you will be breaking away from your husband. If you try to do this on your own, you're still under your husband's control.
Does having a green card affect what happens? Focus is now on keeping immigrants out of our country. Will he be able to return? The possibility of him not being able to return is a very good reason to serve him before he leaves. If you've not served him, there is nothing you can do to get a court order that requires him to pay.
Added: I thought he was from Mexico based on another response. If he's going to another continent, some answers my be different. If he's going a long distance such as to South America or to a country such as Europe or Asia, I would definately serve him before he goes. It's more likely he'll not return when there are distances and air fare. He can only be served in the United States.