How do I get the money from my husband for the tax refund check?

You probably will not be able to get that money from him if it went into a joint account. The child support is a different issue, and you may need to talk to your attorney who handled your divorce about this. Normally, you would ask the court to find him in contempt of court for not paying child support. In some cases, law enforcement will help with matters like that. I don't think you can deny visitation, even if he is not paying the support, if that was part of the custody order.

This is a general response. It is not legal advice. You will need to consult a lawyer about this issue, as it will be part of your overall marital property distribution issue. You can't force him to give you funds unless a master or a judge orders this or he agrees to do it as part of a settlement or voluntarily. If he signed your name to the check and your name was on it, you should contact the taxing authority to report it.

Go back to family court or sue in small claims if within small claims jurisdiction.

It would appear that you have two issues going, the refund check and a divorce. You need an attorney to counsel you on both. If you have a divorce attorney bring the issue up to your counsel. Generally a tax refund is marital property.

You need to bring this to your divorce attorney's attention, immediately. Generally, you cannot lawfully keep him from seeing the children. You need a court order to do that.