There is no relationship other than a close friendship between the two fathers. Chris just told me that he's been asked this a million times. Sonny Parker has one son from a previous marriage. Not two as I stated earlier. His one step brother is named Darryl Parker. He's currently playing professionally in Europe. He played his college basketball at the University of Oregon.
That said, Tony Parker Senior, Tony's dad and Sonny Parker, Chris's dad are very close friends. Both are from Chicago. Both still live in Chicago. They still do a lot together. They are very close friends. However, they are not related in anyway. Not brothers. Not cousins. Just old friends.
There is absolutely no blood relationship between the two Parker families according to Chris.