What can I do to help my boyfriend

Then hire him a private attorney. That is your only option.

Received a civil demand letter, should I pay?

Talk to your attorney. That is what you are paying them for.

Yes they can. I would suggest hiring a local attorney immediately.

What am i looking at for 3rd offense driving while suspended 3rd degree?

Key element is DUI and yes you will face jail time. What can you do, hire an attorney immediately.

Will I have to grant the father of my son visitation and/or custodial rights?

A judge may grant or deny his request for visitation. But he first needs to file one. If he does not then you don't need to grant visitation.

What are the consequences of not paying a speeding ticket for 60 in a 55 in California if I live in Montana?

There is a high likelihood that your license in Montana will be suspended.

I'm being charged with my first class A misdemeanor, for driving while suspended, will I go to jail?

If you got it valid then probably not.

Is there a such thing as joint custody that you can get between a biological parent and a relative that is getting temp custody

Yes there is. You can file a parenting plan together. It will have to be approved by a judge though.

Do I have any rights as a care giver that has raised a child for 12 years if biological mom is in prison & father abandoned kid?

You would have to file a dependent and neglect petition on him. Hire a Nashville family attorney immediately.

How can I gain more time with my daugther and establish my rights as the father? I have already went to court once.

You should hire a local family law attorney immediately in your area.