Well, what is the context? WHat was your mom doing and what was the puppy doing? Were they playing, was she taking something away from the puppy? I'd say its time to start the NILIF program. That is making the puppy wait for its food bowl to be set down, he probably doesn't know any commands yet but you can wait for him to calmly watch you as you lower the bowl and if he starts jumping for the food too soon take it back up and have him calm down. Also start to give him a few pieces of food in the bowl and put the rest in one by one by hand. If he growls say no and stop giving him food for a bit. You should be able to place your hand in his dish without him being food aggressive. Also start with his toys. You should be able to bend down and take a toy from him without being growled at or bitten. Do this in a serious manner, don't play with it or tug it. If he doesn't growl or fuss praise him and give him the toy. If he does say no and hold off on giving him the toy for a bit. When you give it back make him wait for you to give it to him, don't let him take it from your hand. These exercises will help the pup learn who's boss of the house and that he if he growls at you or your mom he won't get what he wants.