If your not going to continue to let them breed get the dad neutered and any male offspring neutered when they hit about 11-12 weeks out of pouch. If there are boy babies it's easier to take dad and offspring at the same time.
Mom could already be pregnant again as it is.
If you choose not to neuter then you'll need to separate the babies from the parents after they've been weened but no sooner than 12 weeks out of pouch or OOP as most of us say.
If you have 2 girls you can keep them together but separate from the parents.
If you have a boy and a girl they will need separated from each other as well as the parents, or the boy needs neutered to prevent inbreeding and not be separated from his sister.
If you have 2 boys you cannnnnnnn leave them intact and together but separate from the parents. However down the road there may or may not be issues that neutering could resolve.
If you neuter dad and male babies they can all stay together
but as I said before mom could already be pregnant again.
If you don't neuter and keep them all together they will inbreed (obviously) and you will quickly be even more overwhelmed.
IF they are first time parents there is a higher risk of something going wrong and or rejecting the joeys. To be prepared for that get a rejection kit and do more reading.
If they aren't new to parenting they know what to do all you need to do is be observant to ensure they aren't neglecting one or both
Breeding gliders is a pretty big topic to cover in one post with no clear question to answer.. You'll find a good bit of information on Suz's site as well as rejection kits and what you'd need. https://www.suzsugargliders.com/handraisingajoey.htm