Can my brother have me evicted from my mother's house if he is executer of estate, and has a power of attorney, I am 1/3 owner

The power of attorney has no meaning here because it died with the death of the person giving the power. The remainder of your question can not be...

What are the first steps should I take in getting my son from his grandparents? His mom passed away one week ago.

I agree with the previous answer. Due to several unanswered questions, it would be best to schedule a consultation with an attorney.

The will dictates who controls what. Adopted and biological children have equal,standing unless otherwise specified in the will..

Your mon need to add the gift off the rings to her will or otherwise give it to you while she is living.

Cargiverr has taken over

Since there is not a question, I do not know what answer to give your. What is your question.

Does a grandmother have rights to grand children?

In Georgia, unless otherwise ordered by their court, grandparents has no rights.

What should I do next on my sons behalf

The best thing you can do for your son is to hire an attorney to represent him. Unless you are an attorney, there is not much you can do.

You would need to file a petition in probate court. It would be in your best interest to have an attorney assist with the matter.

Are there any attorneys that specializes in Father's Rights?

I agree with all of the other attorneys. You need a family law attorney.

Can I get anpostponement on my court date if I'm out of town

You may be able to provided you hire an attorney. Otherwise there may be a bench warrant for your arrest.