Is the child in your care right now? If so, you NEED to call the police and inform them. You also need, preferably the police, if not them then other adult(s) present for pick up or for drop off tomorrow (to inform them their child is not welcome).

Your husband needs to know. You need to be safe. You NEED extra adults present for any future contact with this man.

Send them a email and text message letting them know they are NOT allowed on your property. Let them know the child's belongings are in the mail. I would seriously consider bringing them to the post office immediately and mailing it to them. The cost of postage is worth not having them come near your house.

Let them know the police have been contacted and that you have extra adults on the premises. Usually these types of people don't like to be out numbered so power in numbers.

Report it. Let him know you've reported it and protect yourself. I would inform the other daycare parents exactly what went on and what precautions you are taking. The last thing you need is this dad getting to you through them (making up stories to them etc). I would also consider NOT doing outside time with the kids for a while. Just to keep yourself safe for a bit.