You may request a copy of the notice from your attorney that USCIS sent.

Your parents may extend their tourist visas but the request must be submitted before the expiration of their stay. Retain an immigration attorney...

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You may change the co-sponsor and file a new form I-864 with all the necessary supporting documentation with the NVC.

Here's a link where you can get a general idea on each category and how it works:...

I agree with Attorney Behar, active measures need to be taken in order to show domicile for your US citizen son.

If you have already been provided a social security number, you may indicate that on the form.

Notifying USCIS of your change of address is important especially since USCIS sends notices. Make sure to file an AR-11.

Consult with an immigration attorney after you receive the decision to discuss next steps.

Consult with an immigration attorney to see what options you may have.

Your cousin should apply for a tourist visa. You may sponsor and provide the invitation.