It's a novel or it has the manga?
Novel by author Zig
They said Bliss is also more sane than Chase, out of the 6 kids only the two of them are sane.. though i only read the novel forum so can't confirm..
I haven't read bliss's story yet so I can't confirm also since he was still a toddler in Ashley and Koi's story.
A novel, Zig have a whole ass universe for them. With the series of Kiss Me and Lick Me Up.
Oh wait, Bliss is an omega so that explains why.
In Lick Me If You Can, I really hate Grayson and his twin. Chase was the only (almost) sane person in the family.