Teach your son to express themselves
If you are raising sons do not allow them to nod their heads in response to questions. Use every opportunity to make them talk and express themselves. We have many non -verbal men and when they feel verbally challenged they turn to violence, silence or force. As parents we should verbally engage our sons and allow them to logically explain things. if they are slow and incoherent we should be patient with them but let them talk.