If they are 2 males they have probably reached adolescence and should be separated, our rabbits did this and one did get hurt eventually.
If they are 2 females they are probably all right. Females are less aggressive than males.
if they were raised together like brothers or sisters
I recommend getting a dwarf hamster because dwarf hamsters are less territorial and most of the time can be kept together in the same cage. If you put two Syrian hamsters together they will fight to the death.
No, or yes if you want two mamas if they are dwarf hamsters. If Syrians then no, because they will fight and may even kill each other.
No. They will fight and kill. You could put two Roborovski, Winter White, or Djungarian dwarf hamsters together though.
No, in fact, they are meant to live in pairs.
You don't need two dwarf hamsters for one to thrive, since hamsters are quite solitary and territorial. (They generally attack a partner if they have to live together). However mathematically owning two increases the probability of one thriving (because there's two of them, so if one dies early you still have another chance).
I'd advise against it unless they ar dwarf hamsters. When my family had two male Syrian hamsters, from the same litter, as you've specified, the results were disastrous. They frequently faught, and one day we came home to find one dead with several bites around his neck. In my experience, two male hamsters from the same litter will find a way to make sure that they don't live together. Although dwarf hamsters male and female will live together of the same gender. I have twoo male Russian dwarf hamsters that live together peacefully.
no,after a sertan amont of time hamsters must live in separate cages,unless they are mating
by normal, if you mean sirian hamsters then the main difference is that Chinese hamsters belong to the dwarf hamster species, which are considerably smaller and arent as friendly (believe me, i know, i own two!).
Yes, since Russian Hamsters are Dwarf Hamsters - they can be kept in groups
my two sister dwarf hamsters live together. while they do fight at least once a week, they do play with one another. just make sure they are one sex unless you plan on having them reproduce. yes, a brother and sister hamster can have 'normal' babies. my hamsters angel and daisy are from brother and sister parents.
You should not let hamsters live together. Syrian hamsters are solitary creatures, though, while dwarfs are more social. You could let them live together, though, if they are of the same gender and preferably, of the dwarf variety. Though, at one time, I had two male, Syrian hamsters, who were brothers, living in the same cage, and they never fought.