know nothing and care less (about someone or something)

know nothing and care less (about someone or something)

To have very little knowledge and absolutely no concern about someone or something. A: "Don't you have any family who would take you in?" A: "I had a half-brother who lived upstate, but the last time I checked, he knew nothing and cared less about what happens to me."See also: and, care, know, less, nothing, someone