I get the feeling the son is a reincarnator. That'd explain wanting away from his mom with uncontrolled strength and all being a life ending hazard. Also explains why he wanted to fondle the hero's boobs.
Thanks for the chapter!
And damn, Grand is baby of culture.
That stare Marika gives Dariel in the last page while he look at Grand made me thing of a yandere Marika, thats scary :x