Murderous inherited predisposition 

Great, great event
Birth of three
Happines fills her heart
Pushes inside the womb
8 months of growing
All parts visible
Soon they will be here
Show their faces to light
Last month passed
Time to get rid from those
Nobody knew for real
What happens deep inside...

During 7th month
Her doctor have noticed smth strange
One of three had grown faster
And was more agressive than others

"It's ok" - said doc
And mommy felt safe
But now this little [bad word] Considered his brothers
As a threat to his own body
And started devastation
He bit one embryon
In his neck
Red juice spilled
Out of small aortha [bad word] boneless flesh
He switches to another

While head and decapitated body
Drowned to wombs downside
Trying to sever second's limbs
One leg, one arm but that was not enough
Gritting his belly, till guts are outside
Now peace and safety feeling
Stays in his mind
The happy day is today
In the surgery room
Doctor with horror watches
What left from 2 of 3
His eyes became circle
And skin turned pale
When he saw the 3d
Crawling out himself...

The key to this reality, 
Turned out to be after 
Some 20 years have passed.
Inherited predisposition to [bad word] from the genes that may forever last.
Serial killer has been caught lately...
The court was shocked about 
Aggression and cold-blooded torso murders.

This man was decided to be sent
In for genetic investigation

The former generation member
Of his family had previously
Been caught for [bad word] crimes.
Dangerous nature of genetic heritage