in-law suite

in-law +‎ suite; from the primary users of such suites, i.e., in-laws

in-law suite (plural in-law suites)

1. A division of a housing unit for use by relatives or friends of the primary residents, who would then usually share an entrance, and some shared space; but would be able to live separately, unlike boarders or roommates. There is no additional sound and fire separation as would be found in a multi-unit dwelling of separate apartments. The suite would contain at the least, sleeping, eating and bathing facilities.

• granny suite

• income suite