Which Turbo Tax Version do I need?

Hello! I have children that are required to file tax returns. They received a W2 and also a 1099-INT. Given they receive a 1099-INT will the FREE Turbo Tax version work or do I need to upgrade? Also, would I need to set up a separate Turbo Tax account for all 3 of them or is there an option to file children's returns within my own free account? Thank you!