fruit of (one's) loins

One's child or children; one's immediate or future descendant(s). As the baby-boomer generation ages, many are increasingly relying on the fruit of their loins for financial and medical support. Little could she know that, nearly two centuries later, the fruit of her loins would be in nearly every continent on the planet. I never dreamed that the fruit of my loins would betray me like this! Grandson, how could you do this to me?