Gail and Mark James contributed to the support of their two children, Jack and Jill, as well as Mark's mother, Betty. Jack is a 19-year-old full time student who earned $5,000 this year working at a coffee shop on campus. Jill is 24 years old and worked full-time as a librarian and earned $25,000. Jack comes home during the summer and holidays. Jill lives at home year-round. Betty lives in an apartment in town and received $2,000 in municipal bond interest, $6,000 in dividend income, and $4,000 in nontaxable Social Security benefits. Jack, Jill, and Betty are U.S. citizens and unmarried. Gail and Mark provided more than half of the support for Jack, Jill, and Betty. How many people qualify