familiis
familiis is a Latin form of familia, meaning “household, family”. It is the ablative plural feminine noun or dative plural feminine noun.
Found 27 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Civili 3.103: … et aeris magno pondere ad militarem usum in naves imposito duobusque milibus hominum armatis, partim quos ex familiis societatum delegerat, partim a negotiatoribus coegerat, quosque ex suis quisque ad hanc rem idoneos existimab …
All forms of familia (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.