Aussielad

I don't recall this process. I think she does have her greencard but not sure

UPDATE up until now.....
 
My friend contracted a family lawyer in Colombia and she is now going to handle the case. The lawyer believes that the case is for Colombia and not the U.S. The lawyer also is of the belief that the Colombian woman is borderline extortioning my friend. I am wishing success to my friend that this can be resolved in the best possible manner for all parties involved. I will keep everyone updated. 
 
Thank you to everyone who has put in their two cents. It has been much appreciated with the valuable knowledge provided here. My friend is deeply grateful for the positive vibes from everyone on here.

He's done that, and she in return has told him to go get f!@#$% lol! I think she should just take care of the kid herself and disappear and see how things are from here to 10-15 years time. 

That's what we're here for.  
We hope that things eventuate his way and that he doesn't get hosed in the slightest.
Please do!

How's that possible if she's only on B-2? Unless she plans to overstay her next visit. 

UPDATE up until now.....
 
My friend contracted a family lawyer in Colombia and she is now going to handle the case. The lawyer believes that the case is for Colombia and not the U.S. The lawyer also is of the belief that the Colombian woman is borderline extortioning my friend. I am wishing success to my friend that this can be resolved in the best possible manner for all parties involved. I will keep everyone updated. 
 
Thank you to everyone who has put in their two cents. It has been much appreciated with the valuable knowledge provided here. My friend is deeply grateful for the positive vibes from everyone on here.

UPDATE up until now.....
 
My friend contracted a family lawyer in Colombia and she is now going to handle the case. The lawyer believes that the case is for Colombia and not the U.S. The lawyer also is of the belief that the Colombian woman is borderline extortioning my friend. I am wishing success to my friend that this can be resolved in the best possible manner for all parties involved. I will keep everyone updated. 
 
Thank you to everyone who has put in their two cents. It has been much appreciated with the valuable knowledge provided here. My friend is deeply grateful for the positive vibes from everyone on here.

You sure about that?  I don't think the OP's sister qualifies to transmit citizenship in this case.

UPDATE up until now.....
 
My friend contracted a family lawyer in Colombia and she is now going to handle the case. The lawyer believes that the case is for Colombia and not the U.S. The lawyer also is of the belief that the Colombian woman is borderline extortioning my friend. I am wishing success to my friend that this can be resolved in the best possible manner for all parties involved. I will keep everyone updated. 
 
Thank you to everyone who has put in their two cents. It has been much appreciated with the valuable knowledge provided here. My friend is deeply grateful for the positive vibes from everyone on here.

UPDATE up until now.....
 
My friend contracted a family lawyer in Colombia and she is now going to handle the case. The lawyer believes that the case is for Colombia and not the U.S. The lawyer also is of the belief that the Colombian woman is borderline extortioning my friend. I am wishing success to my friend that this can be resolved in the best possible manner for all parties involved. I will keep everyone updated. 
 
Thank you to everyone who has put in their two cents. It has been much appreciated with the valuable knowledge provided here. My friend is deeply grateful for the positive vibes from everyone on here.

This is why a DNA test would be important.  But I think that he should let her "stew" without giving her the slightest ammunition.

Correct up until a point. CRBA is not as easy as it seems due to the fact that his original proof of U.S. citizenship is required, plus both parents would have to appear before a consulate official. Also remember that she would also need his proof that he has had 5 years of continual U.S. residency through taxes, transcripts, etc, etc, which she does not have access too. 

There is no suggestion he wants the kid. The Mother seems to see the child as an a ATM. Poor child.
 
In my mind the only place currently that has jurisdiction for Child Support is Colombia, the next issue would be enforcing any judgement but that is another issue.
 
If she and the child somehow get into the US on any basis then all bets are off.
 
 
 

Non-immigration and non-family lawyer here. As others have said, and based on the facts we have, the child is not a USC and cannot become one unless your friend is willing to execute the proper papers and stand before a consular officer. No family court judge can confer US citizenship or even compel your friend to jump through those hoops. Likewise, the child would not be entitled to US social security or Medicaid benefits. 
Since your friend and Colombiana were never married, she has no claim to his house. Depending on what state he’s in, he may also have homestead protections which would prevent anyone (even a family court judge) from giving the house to Colombiana. 
Your friend may well owe child support, and there are international laws in place whereby a US family court could enforce the child support orders of a Colombiana court - if Colombiana ever got such an order. I doubt a Colombian court is going to award her the king’s ransom (appropriate word for what she’s trying to do here) that she’s asking for. 
Most importantly, and especially so in light of your friend’s government job, he needs to see a couple of lawyers (immigration and family). This will give him some good information, when knowledge is power. It should also give him some confidence and peace of mind.  I wish him good luck. 

Not stating the obvious, but alimony and child support cases are family court matters, which are State Court (here Georgia).
 
No state judge has any authority to grant U.S. citizenship, nor direct a federal agency (USCIS or the State Department) to recognize the child as a U.S. citizen, which are federal matters. Maybe a U.S. District Court can, but I fail to see legal grounds for the Colombian mother to file a suit.
 
So I agree with what has been written by other posters: unless OP's friend initiates himself the CRBA himself, nothing is going to happen on the citizenship side.
 
 

It is the Georgia bit, I do not see how a visitor could take an action.

Just a thought, too.  If the OP's friend has a government job, especially with a security clearance, he may need to alert a supervisor as to what is going on, in case of a blackmail or extortion attempt.
 
I am sorry for the child in this situation.  I also know what it is like to feel like there is impending doom with a legal case, and how worked up it can make you!  OP - have your friend get a lawyer.
 
Sukie in NY

There's no obligation for father to go through CRBA. It's a question of ethics whether he would want to do it or not. The USC friend needs to realize that by filing CRBA the mother gets avenue to come to the US once the child turns 21 and can sponsor her. Otherwise the mother can pound the sand.

(Member since 2004 -- wow!)
 
Has your friend consulted lawyers?  What have they said?

NZ has been a bit weird 

see....what you FAIL to see...which is so clear, is that a person has rights....its not a simple thing where 'if it doesn't work, send it back"........yeah maybe in your case, but sad for you, however people have rights, and by the way your talking, you aren't that far behind this guy whos threatening his wife to get her thrown out.

what little understanding you have......closed minded......we aren't in Pakistan you know? where the woman has to walk behin the man like a dog on a leash.

I'm not here either to tell you what to do, or not. These are very personal issues that depend SO much on the people involved -- you, him and the other woman. But I do know that sometimes a marriage is worth fighting for -- and sometimes it's not. For me, honesty and openness are the bedrock of marriage, as much as love is, and sometimes even more. There are days when you may not feel like you love your spouse as much as you should, but without honesty the love is hard to maintain. I have to say, an ongoing multiyear affair for me would be a dealbreaker, much more than a one night stand, or a brief fling that was firmly over when I found out about it. Something short-lived can be the kind of mistake that also shows that there is remorse and recognition that this is wrong. Just as an example, I recently found out a good friend is cheating on his wife. He is not willing to end the affair, and his wife is saying that counselling will fix everything. I don't think it will if two people want diametrically opposed things -- one wants a monogamous husband, and the other wants his wife and his girlfriend -- and neither is willing to budge.
 
When you find out things like this, it feels like your life is going to end -- the axis of the earth is off kilter, nothing looks right even though superficially to outsiders everything looks the same. My ex walked out on me and when he did, I felt like life never would be the same again. Actually, that was correct -- life is different now without him, but significantly better, because I chose to make it better. If -- if! -- you choose to move on, trust that you will live. Even if you don't, it's time to gather your team together -- friends and family, wherever they may be -- and lean on them as hard as you need. I couldn't have made it without mine. You deserve happiness -- and if this isn't what happiness looks like, you can find it elsewhere. ❤️ 

You have to decide if you want to work it out or not, first. 

You really need to get yourself stable emotionally before you even think about a third one. My suggestion is go see a psychologist and see where you are going wrong and how to fix it before even thinking about another relationship....other than that, go find someone in the U.S. There's 300 million + people here. GOOD LUCK!