Please for goodness sake, get a private attorney to contact CPS and try for a placement with you. If CPS were to terminate the parent-child relationship and the kids aren't with you- you will be so out of luck. Contact CPS. See if you came to Mineral Wells if it might facilitate a placement with you. Fight now. Don't wait. I had a case 7 yrs ago representing a lady from out of state who's daughter's rights were terminated and the kids placed with her boy friend's family. It was bad. She had waited too long - actually because no one bothered to tell her.
I am not intending this to be legal advice, because I don't know the particulars of your situation. Call me if you would like to discuss this or other isues.
You really need an attorney in this situation. Request to intervene in the lawsuit, you as a grandparent can request custody of the children. There may be someone at the courthouse (Most Courthouses in Texas have self-help centers) to help you with finding the right forms for you to file. You might also call Legal Aid - Texas Rio Grande Legal Aid might help- they sometimes help individuals prepare forms for filing.
Getting your lawsuit filed guarantees you to address the court and seek relief. Ask for temporary placement of the children - explore your options and be aggressive!