Is Minami-ke Okaeri hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2009 · 13 episodes · PG-13 - Teens 13 or older
CGDCT, Comedy, School, Seinen
Although yet another year has passed, the Minami household is still the same as ever. Despite their unusual domestic situation, the three sisters—Haruka, Kana, and Chiaki—are content with their daily lives as they alternate between home and school. With familiar faces surrounding them every day, the girls continue to enjoy their youth to the fullest. [Written by MAL Rewrite]
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