Jim and Kay Ross contributed to the support of their two children, Dale and Kim, and Jim's widowed parent, Grant. During the year, Dale, a 19-year-old full-time college student, earned $5,500 as a babysitter. Kim, a 23-year-old bank teller, earned $12,000. Grant received $5,000 in dividend income and $4,000 in nontaxable Social Security benefits. Kim and Grant currently reside with Jim and Kay. Dale's main place of residence is with Jim and Kay, and he is currently on a temporary absence to attend school. How many dependents can Jim and Kay claim on their joint income tax return?