She shall bear upon my knees; an ellipsis or short speech; She shall bear a child which may be laid upon my knees, or in my lap, which I may adopt and bring up as if it were my own. See Genesis 50:23 Isaiah 66:12. That I may also have children by her; for as servants, so their work and fruit, were not their own, but their masters.
Related Commentaries of Genesis 30:3
Genesis 30:3
3 And she said, Behold my maid Bilhah, go in unto her; and she shall bear upon my knees, that I may also have children by her.