We have had Victor since he was 13 months old. He came from a training facility. His previous owner took him back after a year because she had lots of people in and out of her house and he was having to be crated all the time because he was always trying to attack people. We were told later that he actually bit service guys at her home.We knew he was protective but we did not know the severity of it until later. We being novices at GSDs did not know what questions to ask when we met with his trainers or what we were getting ourselves into. We found out later his mother was aggressive with people and went into a frenzy mode too. I wish to never speak with these trainers again because of their unprofessionalism. Victor's trainer yelled at us and told us to beat him and to put him to sleep when we called about his aggression issues later. He told us I don't want that dog back on his property. He also went back on his 6 month guarantee we had but I would never let Victor go back after the way the trainer acted. We have learned a lot about the GSD in the 7 months that we have had him. It is just myself and my husband and our animals. We chose not to have children and have made our animals our children. My husband is gone a lot so I am by myself most of the time. Victor is very protective of us especially me.Our problem is that no matter how much we introduce him to our family members that visit he tries to attack them. The same family members have had several play sessions with him but no matter what when anyone comes to our property he tries to attack them. We can not trust him with them because if anyone makes sudden movements he tries to grab them.Everyone is uneasy with him except myself and my husband. He has grabbed my nephew's leg and tried to with my niece but I pulled him back. We have used a prong collar, an e collar, we have crated him,he is still aggressive with people. He is super obedient does his commands well. He gets along with my cats,Jamie Lee,all of our pets it is just people he does this with. We just can not control him when people come over he will not listen to his commands if he was to dart out past me and someone was in the yard he would not stop. He goes into a frenzy mode and nothing will stop him from going for someone all his training goes out the window when he is in this mode. I have a lot more incidences with him but this is already long enough. Next is working with him with a muzzle on with his prong collar. By the way we live way out in the country so classes and trainers are not an option for us. This is something we are gonna have to do on our own. Any suggestions would be helpful!! We love this dog and we want to be able to have him included with family functions. Our family loves him but are uneasy around as he is unpredictable with people. Thank you in advance for your help.