Makai no Ossan

Makai no Ossan (魔界のオッサン) is a slice-of-life-in-hell kind of gag web manga about an underworld family consisting of a father called Ossan (who seems to be the the main protagonist), his wife who is the mother of their children. Their oldest son who's the older brother known as Yuuji, a middle-school student called Tarou (the second protagonist next to his father), and the youngest child who is the younger sister called Hitomi. Each chapter is about one page each, and are fairly episodic where most do not continue a following plot while some other chapters do.

Trivia

 * ONE stated that the main protagonist/father known as Ossan is equal in strength to Golden Sperm from One-Punch Man.