What can I do to make sure he doesn't get joint custody w/out any proof?

I agree with David's response, however, unfortunately, depending on the proof and evidence that you can provide to the court, will determine the...

How do I --- 1. get my name on my son's Birth Certificate 2. stop name change 3. regain communication with my son?

You didn't state whether there is anyone on the birth certificate. If the mother's husband at the time of the birth name is on the birth...

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What are my options? Alimony? Can I file child support even though he's still in the house?

You are able to file whatever you like, whether or not you will be successful in all or part of the relief you are seeking depends on the facts and...

What should I do if I don't agree with my Ex wife moving my 3 children out of state?

If the two of you can't agree on a new custody arrangement you should file for a modification ASAP.

I have joint custody and my ex wife wants to move the kids out of state, what are my options?

If the two of you cannot agree on a new schedule then you should file for a modification of custody ASAP.

Under what circumstances can a defendant file a motion to dismiss an upcoming child support case in md?

If there is a written agreement between the parties the case can possibly be dismissed before the hearing.

What can I do to possibly avoid my soon to be ex-wife from being deposed or testifying at trial?

I agree with Mr. DeHaven's response. I would add that your soon to be ex not you holds the privilege. Meaning that if your soon to be ex wants to...

Can my co-parent schedule medical appointments, non emergency, without informing me before hand?

The other parent should be coordinating the non sick visit appointments with you.

What are my options in this situation? Can I just sign my rights over? Can I claim him without permission?

without her consent you would not be able to claim the child on your taxes even though you are paying child support (per IRS regulation). The only...

Is it possible to make my mother's husband leave their house?

I agree with David. I would add she would need to obtain primary custody of the minor children in order for the court to grant you use and possession.