Also remind them, when you talk to them, that a puppy left outside alone can be stolen - not something they want. And even if she barks while they are gone and she is inside, she'll be safer, and the barking will be well-muffled by the walls! Maybe give them a Kong toy, and explain filling it with peanut butter will also keep her busy, as well as not barking! I am glad they all play with her, and seem to be good pet people, if somewhat inexperienced with the "joys" of puppyhood! There's nothing quite so piercing as an "I am BORED!" puppy bark!