By filing a motion in the court that issued the order for support, showing cause why support should be abated (i.e., temporarily stopped).
If there is a court order in place, charges will continue until/unless someone files a motion to abate/terminated support. No, according to Judge David Grey Ross, former Commissioner of the Federal Office of Child Support Enforcement
You should probably consult an attorney. Normally, consultations are free. If the child is supposed to be living with the custodial parent, and is not (and you can prove it), then you may be able to prepare and file a petition to terminate/abate the support. The fact that the 15 year old has a child of her own is not an issue. The 15 year old is not emancipated.
Abate is a verb. Its forms are: abate abates abated abating
what is the root for abate
Run, don't walk to the venue that issued the order for support and file a petition/motion to suspend/abate support. On the other hand, if you cannot afford to help feed, clothe and educate the child you already have, perhaps you should consider not having more children...beyond the one you are about to deliver, that is.
Atnafu Abate died in 1977.
Bob Abate was born in 1893.
Bob Abate died in 1981.
The population of Sant'Antonio Abate is 19,276.
Loris Abate was born in 1928.
Carmine Abate was born in 1954.
Abiyote Abate was born in 1980.