Dr. Jonas Venture, Jr. is the twin brother of Dr. Thaddeus "Rusty" Venture on The Venture Bros.  Somehow fetus Rusty swallowed Jonas up in the womb and laster Rusty emerged as an adult with dwarfism over forty years later through a stomach tumor.

Now Jonas, with half the claim the Venture empire, took Spider Skull Island and the X-2.  He defiitely got the shaft, but he seems to want to have a good relationship with his brother.

Venture Bros. Quotes

Hank: You are not the boss of me
Sgt Hatred: Au contraire, I am tony danza to your spunky Alyssa Milano. I am full on Charles In Charge of you

Hank: Is it just me or does every Nazi want to clone Hitler? It's like the only they think about
Srgt. Hatred: It seems that way, right. I guess when everyone hates you, you just fixate on making rotten Hitlers