“Perhaps I can build a family by her”
Look now, the LORD has prevented me from bearing children. Please go to my maidservant; perhaps I can build a family by her. (Genesis 16:2 BSB)
What it sounds like today
A desperate and rather shocking scheme Sarai invents on her own.
The cultural key
Sarai's plan was not an outlandish improvisation but a known legal custom of the age. Marriage contracts from Nuzi and Mesopotamian law codes provided that a childless wife could give her female slave to her husband, and the resulting child would be reckoned as the wife's own, 'built' onto her house. The Hebrew 'build a family' (banah) puns on 'son' (ben). Sarai is following the culture's accepted workaround for barrenness; the tragedy is that the promise was never meant to run through human engineering.
Recovered meaning
Sarai is not inventing sin from scratch; she is using her society's standard fix for childlessness. The story lets the custom stand as legal and ordinary, then shows the heartbreak that follows when the promise is 'built' by human management instead of trust.