Is this a symptom Schizophrenia?

my parents have to convince me that a certain family member(my brother)is not doing anything to me and he never meant harm...yet i get these voices in my head that are so real i can feel them and they tell me negative stuff that is so hard to block out.It's like a negative chatter in my head that my brother did harmful things to me etc...or that he is doing harmful things.I have to fight it every time...