An inlaw apartment is a type of living space that is designed to accommodate family members who may need extra care or assistance. This type of apartment is often connected to the main house but has its own separate entrance and living area. Synonyms for the term inlaw apartment may include mother-in-law suite, guest house, granny flat, accessory dwelling unit (ADU), or secondary suite. Each of these synonyms describes a self-contained living space that is designed to provide additional housing on a property. These living spaces can be used by family members, guests, or as a rental unit.