i have a question about memory modification. in the beggining of book 4, when the death eaters come to the quiddich world cup and levatate mr roberts and his family, the ministry modifies their memories so they cant remember it. but towards the end of book two gileroy lockhart accidently modifes his own memory but he cant remember ANYTHING like even who he is. so will the roberts' not remember anything? and wouldnt it look sus in the muggle world if they couldnt remember anything??