own flesh and blood

“In fact, the father has treated his own children not as though they were his own flesh and blood but as though they were of as little concern to him as nokhriyyoth, "foreigners," i. e., those of an unsympathetic foreign group.”

Exposition of Genesis: Volume 1

“So the letter had been delivered and the sacrifice was accomplished: a deathlike sweat broke out upon his forehead, and as he raised his hands in consecration his secret prayer was that the offering of his own flesh and blood might be accepted.”

The Mother