If my ex emails me and I tell him to stop and he also sends messages harassing my family, what can I do?

I went through a nasty divorce and had a restraining order at one point. My ex takes care not to harass me anymore and doesn’t have my number, but texts me trying to get me back all the time and then blocks his number and leaves messages that are mean or just irritating on my moms phone. What am I capable of doing? We’ve got children together as well. I have sole physical control and 50/50 lawful control.