Which of the following defines a 'Household member'?

The term 'Household member' typically refers to individuals who live together in a specific domestic setting and share living expenses. In many contexts, including legal and social definitions, a spouse is recognized as a primary household member because they are legally bound in a manner that enhances the interdependency within that living arrangement. Spouses usually have shared responsibilities centered around the household, such as financial obligations and caregiving duties, which distinctly identifies them as household members.

Siblings may live together or be part of the household, but they do not necessarily share the same level of legal or financial obligation as spouses do. Close friends might cohabitate, but without the legal and fiscal responsibilities that come with marriage, they don’t qualify in the same way. Neighbors, although they may have personal relationships, typically reside in separate households and thus do not meet the definition of a household member. Therefore, the most fitting definition of a household member in this context is a spouse.