After Esau leaves, Rebekah speaks to Jacob because of what she heard. Alternate translation: "So when Esau went ... bring it back, Rebekah spoke to Jacob" (See: [[rc://en/ta/man/translate/writing-connectingwords]])
Esau and Jacob were both sons of Isaac and Rebekah. They are called "his son" and "her son" to emphasize that one parent preferred one son over the other son.