What is the name of Isaac and Rebecca's son who tricked his father into giving him his older brother's birthright?

Answer 1

You may be thinking of Jacob, to whom his brother traded the birthright in return for a bowl of red soup ... a clear demonstration of how unimportant it was to him.

Answer 2

The Question conflates two separate incidents. The birthright itself was sold to Jacob willingly, by the brother himself (Esau), not by Isaac their father.

Years later, Jacob posed as Esau in Isaac's presence (Genesis ch.27) and received blessings that would have been given to Esau. Jacob is not to blame, for the following reasons:

1) The word of God had informed their mother Rebecca that Jacob the younger son would be the favored one; the one to prevail (Genesis 25:23). Acting on this, she commanded Jacob to pose as Esau and seek Isaac's blessings (27:6-10), despite his preferring not to do so (27:11).

2) When Esau willingly sold Jacob his birthright (25:31-34), he thereby relinquished any claim to Isaac's chief blessing which would go to the firstborn. The fact that he later complained (27:36) doesn't change this; and he did receive a blessing of his own (27:39).

3) Isaac had not been informed that Esau sold Jacob the birthright. When he was later told this, he understood why God had allowed Jacob to get the chief blessing, and he continued blessing Jacob on later occasions (ch.28). Moreover, God Himself gives Israel (Jacob) the title of firstborn (Exodus 4:22 with Rashi commentary).

Answer 2

The Question conflates two separate incidents. The birthright itself was sold to Jacob willingly, by the brother himself (Esau), not by Isaac their father.
Years later, Jacob posed as Esau in Isaac's presence (Genesis ch.27) and received blessings that would have been given to Esau. Jacob is not to blame, for the following reasons:
1) The word of God had informed their mother Rebecca that Jacob the younger son would be the favored one; the one to prevail (Genesis 25:23).

2) When Esau willingly sold Jacob his birthright (25:31-34), he thereby relinquished any claim to Isaac's chief blessing.

3) Isaac had not been informed that Esau sold Jacob the birthright. When he was later told this, he understood why God had allowed Jacob to get the chief blessing.

See also the Related Link.

Link: More about the Israelite Forefathers