If my daughter who is 18 an still in high school moves out of her mom's house and in with her boyfriend do I still have to pay child support and to who?

Yes you still have to pay but you can go to court to have it end. Until there is a court order saying different you need to pay it the same as you have been.

As noted, in the court order detailing the support is modified or ended, you have to pay. So, if you can prove she is no longer under her mother's care, you can apply to have the order stopped.

Support does not automatically stop just because the child moves and changes where they live. This should be grounds for you to make a motion to have it ended or modified in court.