What is the taxpayers filing status for 2022 in each of the following situations?

Bills wife died in 2021. Bill maintained a household for his two dependent children in 2022.

Bill is unmarried and lives in an apartment. He supported his aged parents, who live in a separate home. Bill provided over half of the cost of maintaining his parents home and also provided over half of each of his parents support.

Bill is unmarried and maintains a household for is 18 year old daughter and her husband. Bill pays over half of the support of his daughter. The daughter files a joint return with her husband.