Are you using the Mobile App or the Online version or the Desktop installed program?
Online is only good for one return per account. But you can use the same email address for 5 accounts. Online is only good for 1 return per account. So don't use your account or you will overwrite your return. Sign up and start a new account here,
https://turbotax.intuit.com/personal-taxes/online
If you have the Desktop program you can do unlimited returns and efile 5. Start a new return, go up to File-NEW. Be sure to save each return with a different name.
If their only income is W2 and under 13,850 they do not have to file a return except to get back any withholding taken out. If they got a 1099NEC for any amount they have to file a return.
They don't have to file if they only have W2 income under 13,850 (2023) but can file to get back any withholding taken out in boxes 2 or 17. But you don't get boxes 4 or 6 back. If they got a 1099Misc or 1099NEC they have to file it as self employment income no matter how small the amount.
Be sure on their return they check the box that says they can be claimed on someone else’s return.
Filing requirements for a dependent
https://ttlc.intuit.com/community/children-dependents/help/do-i-need-to-file-my-own-taxes-if-i-m-a-d...
