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

Hunters Gathers: Her tits were like "coming home from school and finding out your old man ran over your cat" sad.
Brock Samson: Mournful tits. She has mournful tits. They're like two suicide notes stuffed into a glitter bra.

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