So cute! I'm surprised by how different they look from each other, being littermates. I've never house trained a puppy, but I've heard that crates are very useful, and that taking them outside at very regular intervals after eating and drinking also helps. With our dog, when I take him out to the yard, I say "go piddle" or " go poops" and treat him if he does either. If he doesn't do anything within a reasonable amount of time, I bring him inside with no treat, and try again later.