Someone Reached Out To My Husband Threatening To Take Him To Court For Child Support For A Child He Didn’t Know Existed.

Hello all, I want to preface this by saying we are in North Carolina and my husband is active duty military. I have a child from a previous marriage and gave birth just last month to my second child and my husbands first biological child. Last night he got a message from a girl stating that he had a child with her and “just up and left.” Now the conception of that child was before my time with him by a few months however he was deployed when the child was born. Auto him she never told him that she was pregnant and they essentially just stopped talking to each other one day and their fling was over. The child is 4 years of age now and according to the message the mother stated “as (child) gets older they’re getting more expensive so we can either work something out or I will take you to court for child support.” My husband has not acknowledged her message at this point (it still shows as pending so she does not know he has read it). Considering my husband wasn’t even in the country at the time of the child’s birth he never put his name on the birth certificate and because they were not married it is my assumption that she didn’t put his name down on it either. I am one to say to go through the courts, establish paternity and then go in from there. My husband stated that he has not known about the child for 4 years and has no interest in knowing or providing for the child as he doesn’t even know if he is the actual father. He stated that if he is the biological father he would more than likely just sign away any and all rights to the child and continue on with life. Of course my mind is going a mile a minute, you had 4 years to reach out and you do it now? You don’t bother saying “hey you have a kid” and instead go straight into money talk? As of now he has no interest in responding to her message but I want to know what could we possibly expect if he doesn’t? She doesn’t have his information (full name, address, etc) and we could be moving to another base soon. I do have my divorce/family law attorney that I used during my divorce and not sure if I should reach out to her now or wait to see if we get a latter in the mail. My personal opinion is if it is determined that he is the father child support should be established (through the courts) as well as a custody agreement but he is completely against that idea and would rather sign away his rights. Any advice, opinions, and input would be greatly appreciated.