What can I do if father refuses to let me see our son when we have joint custody?

Go to court on a contempt motion if your order says you get to have the child at certain times and the father is withholding him. Don't just pick him up unless there is an order that says when you can pick him up at the sitter's.

If you mean the father is the custodial parent and you share joint legal with equal visitation, you should visit your child as set forth in your written custodial agreement which is probably contained in your divorce papers. If he will not release the child to you during your custodial time, call the police to assist you. If the police refuse to help, any police report will assist you in bringing a case to modify custody. The courts do not reward the parent who refuses to facilitate visitation. I hope the helps.

If the order gives you visitation time and he is not allowing it, you file a motion for dad to be held in contempt for violating the order. If the order allows dad to decide when you see the child, then you will have to wait until there has been a material and substantial change in circumstances to get the order changed.

You need to petition the court for this violation of the custody order.