Is DNA permissible in immigration cases?

I only ask because my Mom--who had to change her name to get her citizenship--is trying to file an 1-30 for me. Due to the name change, we have different last names and her first name does not match what is on my birth certificate. However, we have alot of proof that she has been my caretaker for the past 18 years. Is this enough?

The reason she never tried to file earlier is because she got BAD legal advice that the government would revoke her citizenship if they found out she changed her name.