Final answer:
Jacob obtained Isaac's blessing by disguising himself as his brother Esau and cooking a meal for Isaac.
Step-by-step explanation:
The son who received Isaac's blessing is known as Jacob. He obtained the blessing through deception and disguise. Jacob dressed up as his older brother Esau and cooked a meal for Isaac, who was blind and therefore unable to recognize Jacob's true identity. Isaac was tricked into giving his blessing to Jacob, thinking that it was Esau whom he was blessing.