No.
No, not if they're over 5 weeks of age, they will attack each other and seriously harm each other.
No, Teddy Bears hamsters are very territorial! Actually all hamsters are, especially females. They will harm normally fight each other to the death. So, I would not but them together.
No they will kill each other
Yes, you should keep any males out away from the babies.
No unlike hamsters, the adults will not harm the young guinea pigs.
It is not suggestable as the boy hamster may harm the babies.
Not necessarily. Hamsters can have disagreements or establish hierarchy within their social structure. Sleeping together can indicate that they are comfortable in each other's presence and have accepted each other. It's important to monitor their interactions to ensure they are not causing harm to each other.
no, unlike hamsters the adults will not harm the young.
Hamsters don't really eat other hamsters. Their not cannibals. However, when the babies are first born and one is really ill; the mother may and most likely will eat the baby. Yes, it sounds gross but I think I remember reading somewhere that a lot of animals do that. So if you have a hamster who just had 5 babies and one of them is gone - that's probably why.
It would probably be a good idea to separate the hamsters. However, you can take them to the vets and see what they say if you wish. If both hamsters are causing each other harm its best just to split them up.
I wouldn't suggest it, the hamster might not harm them, but I wouldn't take the risk. We've had mice killed by hamsters, and even by their own mother. Not a pretty picture, so I wouldn't try it until the mice are older.
They can't do too much harm because they're such small animal but they can bite and scratch you.