Your new dog must spend more time with your husband than with your kids. He should take him to the canine good citizen classes and also to basic obedience group classes. They are usually held by local trainers and sometimes by pet superstores. There is no specific training after that, and if you were to fake a seizure to try to train him, the dog would know the difference. Just allow your puppy to become part of your life, do your best to bond with him, and when he is nervous and alerting your husband to the danger, he must pay attention. If something does happen, praise the dog for alerting, give him a special treat, etc.