I disagree
If this behavior where among puppies of the same age, I would say that the White Boxer seems to be ok. But since The fawn boxer is older, I dont think that is normal puppy behavior. The white boxer is defenetly more dominant than his older sis. and since the older sis lets him get away with more, the white boxer is not learning to stop earlier. The part towards the end when he get mad at the fawn boxer for getting up, that should have been the place where another dog with less tolerance would have scolded the pup. This is a sing of a dominant dog, not a bad dog, but one that is going to need more socialization and more disipline. If you teach him early, let the fawn boxer scold him, he should grow up to be a well behaved dog. But I can't stress enough how important it is for you to socialize him, with other dogs shapes, sizes, and ages in particular.