“Eng verified” thus means: There is a proven, trustworthy, long‑term social bond between the two families.
This seems like a caption, comment, or game phrase (possibly from a visual novel, manga, or online discussion). Since you want a for this keyword, I will assume it refers to a common narrative trope in Japanese media (anime/manga/light novels) where a protagonist shares a room or stays overnight with a relative's child (often a cousin), and an English-speaking audience has verified or discussed the phrase. shinseki no ko to o tomari da kara eng verified