I am a widowed disabled father. Should I file my childrens ssa-1099 and w-2?

[VolvoGirl]

You don't include their income on your return. It would only go on their return if they are required to file one.  If they only get ssi or SS, SSDI or a SSA-1099 they don't have to file a return and nobody reports it.

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...

Online is only good for 1 return per account.  But you can use the same email address for 5 accounts.   How to start another return in the Online version

https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...

Or go to the IRS Free File programs

Free File: Do your Federal Taxes for Free | Internal Revenue Service