I have some questions for you guys?

There is only one species of snake that I am familiar of that is territorial to humans. The black mamba. Sand only goes with desert reptile species. If your snake is of a tropical nature, a tropical humidity bearing substrate is best. Keeping babies together is okay. Once they become sub-adults, it is best to provide them with their own enclosures. Give your snake more time to get used to being handled. The fact that your snake is going to the bathroom in your hands is an indication of stress still. In time and with positive handling of your snake, this will stop.