It was Cain as Abel was killed.
There is no biblical record of any children of Abel, but even if he did, all his descendants would have been killed in the flood.
The bible does not say exactly how many children Adam and Eve had .But they had sons and daughters beside Abel and Cain, so Cain married his sister.
Cain and Abel were Adam and Eve's sons. Cain killed Abel out of jealousy of his generosity.
Cain and Abel.
Cain and Abel were the sons of Adam and Eve. Cain killed his brother Abel out of jealousy and anger.
Abel was killed before he had a chance to marry. Adam's unnamed sons (Genesis ch.5), and Seth, married nieces and grandnieces. Cain, who was the first son of Adam to get married, had no choice but to marry one of his sisters (Rashi commentary, Leviticus 20:17).That isn't clarified in the Bible.
Cain, Abel,and Seth were their sons,but Cain killed Abel out of jealousy.
Adams children are abel, Cain, and Seth.
Later in the Bible it says that Adam had more sons and daughters, and since there were no other families, they had to marry each other and reproduce.
The sons had to marry their sisters. Adam and Eve were the only 2 people on the earth.
You and your wife have had a child and you name him Adam, then Adam grows up and has two children that he and his wife named Cain and Abel. Cain and Abel are your grandchildren. When Cain and Abel grow up and have their own children, these children are your great grandchildren.