If he were exercising his treaty rights in another country, your previous denial would have no effect on his ability to bring you to that country in the EEA. It would be very difficult for another country in the EU/EEA to deny you the right to live there provided your husband was exercising his treaty rights (working, running a business, school, etc, although the first one would be the easiest in terms of not having to have means or health insurance). You would not have to pay for your permits/visas either. The EU allows nations to regulate their own citizens' abilities to bring foreign family into the country. They don't allow much regulation when it's another EU national living in a country other than their own. ETA: You would have to be a serious threat to national security or in serious violation of immigration fraud for a country to have a case against a non-EEA spouse. And to travel in the EU, your husband has the right to have you with him. Your passport and marriage certificate is all that is needed. Seriously.
And of course the most ideal thing would be to keep your child with you and to be reunited with your husband. However, I was talking about the option of sending him or her over if you seriously felt that your mother was going to try to get the child put into care...