Well, you need to let them know that surprise visits are a big no-no. They need to discuss this with you or at least your dad who can then run it by you. If you're not up to discussing with them, maybe ask your dad to do it for you. Let him be the guard at the gate. Tell him that you're not good for visiting now and to run things by you first. I bet he will do it. Dad's can be very protective especially if they know what and how is best to go about that.