if you've only had them for 4 days i wouldn't touch them too much until the babies are older. it really depends on the glider. if yours are really friendly then they'll be ok with it but if not then they might think you're trying to take their baby.
my girl is pretty bonded so she doesn't care if i take her babies but as soon as the babies cry she'll pick em up and take em back to the pouch. i'd give it a few days and try to pet the babies in the pouch with the mom and dad in sight and see if they react. if they don't want you touching their baby, you'll know.