Lenny (41) is unmarried. His single mother, Gladys (84), lives in a nursing home. They are both U.S. citizens and have social security numbers valid for employment. Lenny pays the entire cost of the nursing home and more than 50% of his mother's total support. Lenny's wages are $74,831 in 2021 and $65,390 in 2019. Gladys' income consists of $1,800 taxable interest and $11,233 social security benefits. Lenny has no foreign income or investment income. He would like to claim his mother as a dependent if she qualifies.

What is Lenny's correct and most favorable 2021 filing status?

What is Gladys' dependency status for Lenny?

Is Lenny eligible to claim the Child Tax Credit and/or the Other Dependent Credit for any potential dependent? Choose the best response.

Is Lenny eligible to claim and receive the Earned Income Credit?

Is Lenny eligible to utilize the 2019 lookback provision for the Earned Income Credit?