In order to have DNA paternity testing completed, the child will need to be in contact with the suspected father or the parents of the suspected father. DNA testing is not limited to the DNA of the suspected father.

There are cases where the mother of the child will not allow the child to test the suspected father for paternity. This could be due to a variety of reason including embarrassment and the legal ramifications of establishing a legal father for the child. In order to have DNA paternity testing completed, the child will need to be in contact with the suspected father or the parents of the suspected father. DNA testing is not limited to the DNA of the suspected father. If the grandparents are willing to work with the child, the DNA paternity test can establish whether or not the child is biologically related to the grandparents. If this connection is established, the parentage could also be narrowed down. If the grandparents only had one son, there is reason to believe that son is the father of the child.
If the father is willing to undergo paternity testing with the child, home paternity tests can start off the process. While these tests are not permitted in a court of law, they could be great leverage with an attorney who will fight for the legal naming of the father in the case. Without a doubt, the child will need a person of legal age helping them to establish paternity.
In some states, the paternity laws limit the time frame a DNA test can be ordered by a court of law. Even if the child were to convince the mother to demand paternity testing, this statute of limitations could prevent the suspected father from taking the test if he is unwilling.