What can I do when my girlfriend won't let me see my son?
2 attorney answers
You need to start an action in Court to establish your paternity, custody, visitation, and child support rights and obligations.
You will want to get an attorney to help you with this.
Also, look at the SD Parenting Guidelines for some assistance.
I am only providing general advice. I am not acting as your attorney nor does this create any attorney-client relationship.
You need to file a complaint for custody (even if you are willing to allow her to be he primary physical custodian) and get a court order in effect as to when each parent will have parenting time. Talk to a family law attorney near you for more information.