Op sociopaths are not born, but creates when real love bonds are not made. Your partner helped create him, so you better make sure he does not fuck up the rest of his family. If he had to stable loving parents this thread would likely not exist.

I bet your husband or partner was too busy with his own life to be there for his son. You can not fix a sociopath and the best thing to do is remove them from your life. I would leave the husband and him to sort their lives out.

If you stay with this family you will have a life of misery.