Yesterday afternoon NDN asked if their son's GF could park outside our house, we don't park directly outside so DP said that would be fine. So later on I was sat in the living room and heard a massive bang outside, looked out the window and saw that the GF had crashed into our front garden wall. NDN had said earlier she has just passed her test so she's obviously not a very confident driver. GF and NDN son were stood outside a while trying to reverse and park the car properly then just went in their house! They saw me in the living room so they know I saw them hit the wall. The wall isn't knocked down but it's really scratched. AIBU or are they CF for not coming and apologising?