Elizabth (27) is unmarried her young sister, Seraphina (21) lined with her all year. Both have a social security numbers that are valid for employment. Seraphina is not a student. Elizabeth paid all of her own support and the household expenses. She paid 78% of Seraphina's support and Seraphima paid thw balance of her support. Seraphina ia not permanently and totally disabled. Elizabeth's 2021 earned income and AGI were $27,852 and her 2019 earned income was $24,393. Elizabeth did not have any foreign income or investment income. Seraphina's gross incomewas &3,793. Everyone listed is a U.S. citizen.

What is Elizabeth correct and most favorable 3021 filing status?

what is Seraphina dependency status for Elizabeth?

Is Elizabeth eligible to claim the child tax credit and or the other dependent credit for any potential dependent?

Is Elizabeth eligible to earned income credit?

Is Elizabeth eligible to utilize the 2019 lookback provision for the earned income credit?