Read Genesis 30:3 Using Other Translations
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.
Then she said, "Here is my servant Bilhah; go in to her, so that she may give birth on my behalf, that even I may have children through her."
Then Rachel told him, “Take my maid, Bilhah, and sleep with her. She will bear children for me, and through her I can have a family, too.”