in-law suite

Short definition from Wiktionary

Noun

1. 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 bathi