2 Lambs = 2 Sons
A bull = General
Because Japan and UN ban possession of child abuse images. Even though the law excludes anime and manga, it's still too risk, so i think the writer let readers think on their own.
The sons just became crazy after their mom was killed before their eyes so they're enjoy with yummy lamb with daddy

we are on the same page,ok? No drug, no violence in this gaurmet