My son has tbi and constantly cusses and uses fowl language. This goes on all day and he wakes up at night hollowing and calling people that are not here. He has always been respectful to me until now and he cusses me out all the time now. He argues about everything you say and calls me a lie. He has to have help with most everything and cannot hardly carry on a normal conversation just talks like he is in the past. Is this normal, I have to listen to this all day and half the night I am at my wits end. Any suggestions?