The operation process of paternity testing: First, you need to choose a formal paternity testing agency for testing. Then, DNA samples from the individual and child are obtained for testing. Generally speaking, institutions will provide designated sampling equipment to ensure the rigor and reliability of sampling. Parents can choose oral swab sampling, blood sampling or saliva sampling, and put the samples into designated collection tubes. Next, the samples are sent to a laboratory for testing and comparison. The laboratory will test the DNA sequence in the sample and compare the results to the child\’s DNA sequence. Typically, this process takes several business days. Finally, parent-child learning