#12 like most animal babies they do enjoy to play rough and tumble with each other to prepare themselves for adulthood and bee protective of their territory, this gold hamsters do in the wild, and the pet gold hamsters does this too, in their cases, in case a hamster would show up on their domain. They also put their sent on several things to mark their territory to tell other hamsters to stay off, same does your pet hamster in his cage cage, if the cage is new. But yes, just like all animal babies, they enjoy playing with each other and often sleep next each other too, for comfort. 