Their brother's name was Seth, but he was born a few years after Cain killed Abel, and he was banished for his crime. (Genesis 5.3)
Abel does not have a younger brother, he is infact the younger brother to Cain. Cain kills his younger brother, Abel.
Abel was Cain's brother, that he killed.
If you go by the Bible its Cain and Able. They are suppose to be the first siblings and Cain kills Able because God prefers Ables sacrifice.
Cain took his brother to the field ... where he murdered him.
Cain. KJV
Abel
Abel
Because Claudius killed his brother {( Old Hamlet)} just as Cain killed his brother {(Abel)}
According to the Bible, Cain killed Abel because he was jealous that Abel's sacrifice was accepted by God, while Cain's was rejected. "And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him." - Genesis 4:8
Cain and Abel were the sons of Adam and Eve. Cain killed his brother Abel out of jealousy and anger.
Cain Marko, the Juggernaut, is his step-brother. He does not have a natural brother.
The first lie was told by Cain to God. God asked Cain where his brother, Abel, was. Cain told God that he did not know, then posed the famous question: "Am I my brother's keeper?".