These are very specific questions that you should consult a local attorney for.

Depends on if alimony was modifiable or not. If no change in circumstances she does not have a good case.

Does handing a prison guard documents addressed to the court have the same effect as though the document arrived in the mail?

Your ability to find that case will be about the same as most attorneys.

Legal question

There is a statute of limitations and it depends on how old you are now.

I have a friend who has to pay child support every month. But these days the financial condition is getting not that good.

Non payment of child support will eventually end up with your friend getting put in jail.

Do grandparents have any visitation rights?

They do in most states. You will have to file with the court to get orders.

Got married to US citizen. Do I have to do my medical examination after i receive my interview appointment letter or before i go

This is an immigration question it appears and I changed the topic.

How can I fight this

You will need to file a modification with the court to make a change.

Use your legal name on the forms as it is now.

How can you help kids if CPS will not get involved?

File an action in the family court.