Is it legal for a duplex owner to refuse rental to a family with children?

The correct answer is that it is legal for a duplex owner to refuse rental to a family with children based on the Fair Housing Act. The Fair Housing Act prohibits discrimination in housing based on several protected classes, including race, color, religion, sex, national origin, disability, and familial status. Familial status, which includes the presence of children under the age of 18, is a protected characteristic under this act.

However, there are exceptions and nuances depending on specific situations and local laws. For example, if the duplex is designated as "housing for older persons" or is a single-family home that is rented by the owner who owns three or fewer properties and does not use a broker, certain exemptions can apply. In the context of the question, since it specifies a duplex owner, who typically may not fall under such exemptions, it could be assumed that the refusal is legal unless local laws impose stricter regulations against such practices.

Local laws can vary and may provide additional protections that could impact this situation; however, generally speaking, a duplex owner can refuse rental to a family with children unless local statutes specifically prohibit such discrimination.