One of the main themes is jealousy. Cain was jealous of Abel because God had regard for Abel's offering but not Cain's. Another theme is the consequence of sin. Cain's act of murdering Abel led to his own downfall and exile.
It's hard to say who painted the most famous version of the Cain and Abel story. There are so many great artists throughout history. Titian was a master painter and might have created a painting related to it. Also, Michelangelo, with his deep understanding of religious stories, could have made a significant work on this, but there isn't really one that stands out above all others as the 'most famous' one.
The story of Abel and Cain was a story in the Bible, recorded in Genesis. Abel was a shepherd, Cain was a farmer. They worshiped God together and each offered sacrifices to God. However, God only accepted Abel's sacrifice, not Cain's. Cain was so angry and jealous that he killed Abel. God rebuked Cain and announced his punishment, making him a fugitive. Cain thought that the punishment was too heavy and was worried that someone would come to avenge Abel. God gave Cain a mark as a warning to stop people from hurting him. This story revealed the sins of mankind and God's judgment, as well as the injustice of Abel and the consequences of Cain.
The story of Cain and Abel is from the Bible. Cain and Abel were brothers. Cain became jealous of Abel because God favored Abel's offering, and Cain ended up killing Abel.
There is no actual 'real story' in a literal sense for Kane and Abel. But in the fictional narrative, Kane is born into a wealthy family and has all the privileges that come with it. Abel, on the other hand, is from a poor background and has to struggle hard. Their upbringing makes a huge difference in their outlooks and approaches to life. Kane is used to getting what he wants easily, while Abel has to fight for every little thing.
In the Bible, Abel was the second son of Adam and Eve. He was a shepherd. Abel offered a sacrifice to God from his flock, which was pleasing to God. His brother Cain, a farmer, became jealous because God had regard for Abel's offering but not his own. In a fit of rage, Cain murdered Abel. This was a very tragic event in the early history according to the Bible, representing the first instance of human sin of murder in the story.