Overflow

Best family friendly "anime" ever. With good plot too. Perfect for the whole family, especially your step siblings.

And definitely not just a hentai

Person 1: Bro, I heard your family need to go to therapy yesterday. What happened?
Person 2: I heard about this anime that people said is friendly-family, show I decided to watch it with the whole family.
Person 1: What is the anime?
Person 2: Overflow.
Person 1: Oh....