Honestly, it would be better if you and your mom bond with both of them, at least in the beginning.
Gliders can bond to more than one person at a time. In the beginning the gliders are going to comfort each other and separating them ( even separating them for an hour for bonding time ) will only cause them more stress and make it harder on you and them.
It would be wise for both you and your mom to be able to handle both gliders. There may come a time where you or your mom can't do their part for their specific glider and the other has to fill in and do it.
Say you go away for the weekend, and your glider gets out of the cage while your gone, your mom needs to be able to handle that glider and get it back in the cage.
Vice versa, say your mom is at work and her glider gets a nail caught on the pouch, you need to be able to handle that glider to help it.
Once the gliders get comfortable with their new environment, and both you and your mom then you can focus on bonding with yours one on one and your mom with hers one on one. But until then, I would strongly suggest you and your mom bond with both of them.