During 2022, Robert Moore, who is 50 years old and unmarried, maintained his home in which he and his widowed father, age 75, resided. His father had $3,450 interest income from a savings account and also received $3,450 from Social Security during 2022. Robert provided 60% of his father's total support for 2022. What is Robert's filing status for 2022, and how many dependents should he claim on his tax return?