Hello, if you really want to determine whether there is a genetic relationship between father and son, then you should judge whether it is a parent-child relationship through DNA testing, based on genetic similarity.

Paternity identification and judgment method

The purpose of paternity test is only to know the result of paternity test. If you can't find an appraisal unit in the local area, you can choose to send the appraisal samples of both parties to the paternity test center as required to understand the appraisal results.