
Originally Posted by
jonnyboiy
Go to a local family law court in your area and ask for a petition for "gran parents" rights
Since you are new here, you may not be aware that we apply a higher standard of accuracy to answers in the legal forums. Answers need to comply with existing statutes. Most states that have grandparents laws are like Texas where grandparents have standing ONLY if their child no longer has parental rights. That is not the case here. Therefore the OP has no legal standing at this time.
However, the son does. The mother's parents cannot keep the father from having visitation with his child unless they can prove he is a danger to the child. So the son should file a petition with the local Family court for Joint legal custody and visitation. The mother will probably file for child support.
If the son needs legal help in doing the filing, he can try a father's support group or a local law school that may run a clinic.