Who are the parents of Cain and Abel?

A:Biblical rivalry between Cain and Abel begins with their birth. In Genesis 4:1, Eve exults over the birth of Cain, but Abel is merely introduced as Cain's brother, with no relationship to his mother. They both make sacrifices to God, but Cain only gives grain, while Abel sacrificed a young lamb, for which God could not hide his pleasure. This made Cain angry and God, rather than placating and encouraging him, scolded Cain for showing his feelings. Later, when they were in the fields, Cain rose up against Abel and killed him.

God somehow knew that Cain had murdered his brother and declared him henceforth a fugitive. Although The Bible makes it clear that until now there was no one else in the world other than Adam and Eve, his parents, Cain feared that everyone would want to kill him for what he had done, so God set a mark on Cain so that all who met him would not kill him.

Asaph Sagiv believes that there is an Egyptian antecedent to the story of Cain and Abel. He suggests that the Cain and Abel story represents a biblical countermyth to the Egyptian story of Osiris and his brother Seth, although in the biblical case, Seth is not born until after the death of Abel.

1And Adam knew Eve his wife; and she conceived, and bare Cain, and said, I have gotten a man from the LORD. 2And she again bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground. 3And in process of time it came to pass, that Cain brought of the fruit of the ground an offering to the LORD. 4And Abel also brought of the firstlings of his flock and of the fat thereof. And the LORD had respect unto Abel and to his offering: 5But unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell. 6And the LORD said unto Cain, Why are you wroth? and why is your countenance fallen? 7If you do well, shall you not be accepted? and if you do not well, sin lies at the door. And to you shall be his desire, and you shall rule over him. 8And 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. 9And the LORD said to Cain, Where is Abel your brother? And he said, I know not: Am I my brother's keeper? 10And he said, What have you done? the voice of your brother's blood cries to me from the ground. 11And now are you cursed from the earth, which has opened her mouth to receive your brother's blood from your hand; 12When you till the ground, it shall not henceforth yield to you her strength; a fugitive and a vagabond shall you be in the earth. 13And Cain said to the LORD, My punishment is greater than I can bear. 14Behold,you have driven me out this day from the face of the earth; and from your face shall I be hid; and I shall be a fugitive and a vagabond in the earth; and it shall come to pass, that every one that finds me shall slay me. 15And the LORD said to him, Therefore whoever slays Cain, vengeance shall be taken on him sevenfold. And the LORD set a mark upon Cain, lest any finding him should kill him.
See Genesis ch.4.