Yes, you can share a bed with biological brothers. But you have to set boundaries in case one tries to veer off the road into uncharted territory.
I grew up in a typical African household where there are many siblings but less space for everyone to sleep in an own bedroom let alone a bed.
To make matters worse, my parents were the most well-to-do on both sides. This made their respective siblings to send them their own children for “proper” upbringing, wrapped in an agenda to tap into the assured financial abundance which would cater for their education.
Therefore, we not only grew up as siblings, but cousins, nieces and nephews alike. We were 22 in total in a single homestead. Therefore, any siblings Can share a bed if they don’t infringe on the other’s privacy, deliberately.
Here, we respect one another’s privacy amidst the limited space. Astoundingly, there were no cases of incest, at least to the best of my knowledge.