Your dog is being territorial. It smells your new pheromones on your clothes as something foreign and is re-scenting (also it can be a sign of stress, depending on the situation and frequency). As for being protective of your mother, that's the mark of a good dog, but also an over protective animal can be quite a handful (and potentially dangerous). You may need to regain your pets trust again, this could take awhile. I cut up hot dogs into small bite size pieces and use them as training incentives. (Pretty soon just your praise should be enough and the treats won't be necessary.) I'm sure you don't want to smell like hot dogs constantly but if your dog associates you with the smell of hot dogs and playtime or receiving a reward, his behavior should change but you need to remain consistent with your punishments, rewards and treatment. Your family may also need to show the dog less affection in your presence so he can re-bond with you, but in time this should resolve itself if you're consistent.