110 ILCS 167/15
"Alumnus" means a graduate of a public institution of higher education.
"Familial relationship" means an individual's father, mother, son, daughter, brother, sister, uncle, aunt, great-aunt, great-uncle, first cousin, nephew, niece, husband, wife, grandfather, grandmother, grandson, granddaughter, father-in-law, mother-in-law, son-in-law, daughter-in-law, brother-in-law, sister-in-law, stepfather, stepmother, stepson, stepdaughter, stepbrother, stepsister, half brother, or half sister; the father, mother, grandfather, or grandmother of the individual's spouse; or the individual's fiance or fiancee.
"Legacy status" means the familial relationship of an individual applying for admission to a public institution of higher education to an alumnus or former or current attendee of the public institution of higher education.
110 ILCS 167/15