Formerly known as just "TheKings":thekings_(artist), TheKingBros mostly focuses on telling the story of the King family, whose family tree can be viewed here
Their characters include:
dr._ingot_(character)
flint_king_(character)
rocky_king_(character)
cole_king_(Character)

titus_junior_(character)
mr.faron_(character)

And many, many others. Even the author has admitted to having to look at old art to remember certain character names. This isn't helped by the fact that many characters go by multiple shortened names or nicknames.
The most common themes in their work tend to be rough_sex (Often straying into rape and questionable_consent)and incest, but they also have more tame arcs, as well.
A lot of the art relies on previous knowlege, so if something doesn't quite make sense, carefully rereading previous works may help.