First and foremost, you need to bring him to the vet and get a urinalysis done to make sure there is no infection. Does he have his shots? Is he neutered?

Provided everything turns out okay, you need to get him comfortable with you and your family. Obedience class works wonderful-builds confidence. Puppy pads aren't always encouraged, as they do encourage pottying in the house. Lots of goodies and love always help. I would suggest crate training-when he is unsupervised, he goes into the crate.