Which law in Illinois prohibits discrimination against families with children under 18 years of age?

The Illinois Human Rights Act is the correct answer because it specifically addresses issues of discrimination in various aspects of life, including housing, employment, and public accommodations. One of its critical provisions prohibits discrimination based on familial status, which includes families with children under 18 years of age. This law aims to ensure equal opportunities for residents in Illinois, protecting them from discriminatory practices that could arise due to their family status.

The Illinois Constitution does not explicitly address issues related to familial status in a specific manner, which makes it less applicable in this context. The Illinois Judicial Reform Act primarily focuses on the administration of the judicial system and does not pertain to housing discrimination or familial status. The Illinois Civil Rights Act also addresses civil rights issues but does not specifically emphasize the protection against discrimination based on familial status as comprehensively as the Illinois Human Rights Act. Thus, the Human Rights Act serves as the key legislative framework for protecting families with children from discrimination in Illinois.