Girlfriend need to file an EPO for protection. If CPS intervenes, and intends to remove kids, grandma may be an option.

Just follow the court orders and don't give any extra time. ...

No, you have no rights to custody of grandchildren and every state has rules/case law about this topic.

You can communicate through a parenting app instead, but generally you should have his number for emergencies.

Yes, but depending on what he's trying to prove a judge may shut it down. ...

Follow your agreement/court orders until they change. ...

It sounds like this issue is already addressed in your Decree. You needed a lawyer then not now.........

Yes they can do this and it is enforceable. ...

You need an attorney as does bio dad (a different atty). It is not free, you will need to pay for your atty, filing fees, etc. Offer to cancel...

Cooperate, follow the CPS plan, get an attorney if needed. ...