Joseph provides $12,000 of support for his mother, Miriam, who lives with him. Miriam is single and a U.S. citizen. Her only income is Social Security of $5,000 and taxable pension income of $4,200. Miriam uses the Social Security income for support but puts her pension income into her savings account. Joseph provides $6,000 of support for his 22-year-old son, Mike, a full-time student who attends college on a basketball scholarship and lives with Joseph when not at school. The balance of Mike's support comes from the scholarship that pays his $10,000 tuition and fees for the year. How many dependents can Joseph claim on his tax return?